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Finding the Fourth Proportional to 728.72, 1,088.58 and 655.49

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Solution

The fourth proportional to 728.72, 1,088.58 and 655.49 is: 979.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.72 : 1,088.58 = 655.49 : x
  2. Step 2: Convert to fraction form
    728.72/1,088.58 = 655.49/x
  3. Step 3: Cross multiply
    728.72x = 1,088.58 × 655.49
  4. Step 4: Simplify right side
    728.72x = 713,547.86
  5. Step 5: Solve for x
    x = 713,547.86/728.72
  6. Step 6: Final answer
    x = 979.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.