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Finding the Fourth Proportional to 1,240.76, 1,711.45 and 762

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Solution

The fourth proportional to 1,240.76, 1,711.45 and 762 is: 1,051.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.76 : 1,711.45 = 762 : x
  2. Step 2: Convert to fraction form
    1,240.76/1,711.45 = 762/x
  3. Step 3: Cross multiply
    1,240.76x = 1,711.45 × 762
  4. Step 4: Simplify right side
    1,240.76x = 1,304,124.90
  5. Step 5: Solve for x
    x = 1,304,124.90/1,240.76
  6. Step 6: Final answer
    x = 1,051.07

Related Problems

Find fourth proportional to 620.38, 855.73 and 381
Half scale
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Double scale
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Similar ratio
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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.