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Finding the Fourth Proportional to 904.76, 1,245.79 and 771.69

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Solution

The fourth proportional to 904.76, 1,245.79 and 771.69 is: 1,062.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.76 : 1,245.79 = 771.69 : x
  2. Step 2: Convert to fraction form
    904.76/1,245.79 = 771.69/x
  3. Step 3: Cross multiply
    904.76x = 1,245.79 × 771.69
  4. Step 4: Simplify right side
    904.76x = 961,363.69
  5. Step 5: Solve for x
    x = 961,363.69/904.76
  6. Step 6: Final answer
    x = 1,062.56

Related Problems

Find fourth proportional to 452.38, 622.90 and 385.85
Half scale
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Double scale
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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.