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Finding the Fourth Proportional to 802.47, 1,107.22 and 553.71

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Solution

The fourth proportional to 802.47, 1,107.22 and 553.71 is: 763.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.47 : 1,107.22 = 553.71 : x
  2. Step 2: Convert to fraction form
    802.47/1,107.22 = 553.71/x
  3. Step 3: Cross multiply
    802.47x = 1,107.22 × 553.71
  4. Step 4: Simplify right side
    802.47x = 613,078.79
  5. Step 5: Solve for x
    x = 613,078.79/802.47
  6. Step 6: Final answer
    x = 763.99

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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.