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Finding the Fourth Proportional to 728.76, 1,006.38 and 555.24

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Solution

The fourth proportional to 728.76, 1,006.38 and 555.24 is: 766.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.76 : 1,006.38 = 555.24 : x
  2. Step 2: Convert to fraction form
    728.76/1,006.38 = 555.24/x
  3. Step 3: Cross multiply
    728.76x = 1,006.38 × 555.24
  4. Step 4: Simplify right side
    728.76x = 558,782.43
  5. Step 5: Solve for x
    x = 558,782.43/728.76
  6. Step 6: Final answer
    x = 766.76

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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.