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Finding the Fourth Proportional to 728.88, 1,005.86 and 430.14

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Solution

The fourth proportional to 728.88, 1,005.86 and 430.14 is: 593.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.88 : 1,005.86 = 430.14 : x
  2. Step 2: Convert to fraction form
    728.88/1,005.86 = 430.14/x
  3. Step 3: Cross multiply
    728.88x = 1,005.86 × 430.14
  4. Step 4: Simplify right side
    728.88x = 432,660.62
  5. Step 5: Solve for x
    x = 432,660.62/728.88
  6. Step 6: Final answer
    x = 593.60

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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.