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Finding the Fourth Proportional to 775.52, 1,070.20 and 499.52

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Solution

The fourth proportional to 775.52, 1,070.20 and 499.52 is: 689.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.52 : 1,070.20 = 499.52 : x
  2. Step 2: Convert to fraction form
    775.52/1,070.20 = 499.52/x
  3. Step 3: Cross multiply
    775.52x = 1,070.20 × 499.52
  4. Step 4: Simplify right side
    775.52x = 534,586.30
  5. Step 5: Solve for x
    x = 534,586.30/775.52
  6. Step 6: Final answer
    x = 689.33

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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.