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Finding the Fourth Proportional to 728.32, 1,004.64 and 553.60

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Solution

The fourth proportional to 728.32, 1,004.64 and 553.60 is: 763.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.32 : 1,004.64 = 553.60 : x
  2. Step 2: Convert to fraction form
    728.32/1,004.64 = 553.60/x
  3. Step 3: Cross multiply
    728.32x = 1,004.64 × 553.60
  4. Step 4: Simplify right side
    728.32x = 556,168.70
  5. Step 5: Solve for x
    x = 556,168.70/728.32
  6. Step 6: Final answer
    x = 763.63

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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.