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Finding the Fourth Proportional to 775.78, 1,071.21 and 527.62

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Solution

The fourth proportional to 775.78, 1,071.21 and 527.62 is: 728.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.78 : 1,071.21 = 527.62 : x
  2. Step 2: Convert to fraction form
    775.78/1,071.21 = 527.62/x
  3. Step 3: Cross multiply
    775.78x = 1,071.21 × 527.62
  4. Step 4: Simplify right side
    775.78x = 565,191.82
  5. Step 5: Solve for x
    x = 565,191.82/775.78
  6. Step 6: Final answer
    x = 728.55

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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.