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Finding the Fourth Proportional to 1,262.76, 1,742.54 and 738.76

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Solution

The fourth proportional to 1,262.76, 1,742.54 and 738.76 is: 1,019.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,262.76 : 1,742.54 = 738.76 : x
  2. Step 2: Convert to fraction form
    1,262.76/1,742.54 = 738.76/x
  3. Step 3: Cross multiply
    1,262.76x = 1,742.54 × 738.76
  4. Step 4: Simplify right side
    1,262.76x = 1,287,318.85
  5. Step 5: Solve for x
    x = 1,287,318.85/1,262.76
  6. Step 6: Final answer
    x = 1,019.45

Related Problems

Find fourth proportional to 631.38, 871.27 and 369.38
Half scale
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Double scale
Find fourth proportional to 1,263.76, 1,743.92 and 739.76
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.