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Finding the Fourth Proportional to 802.30, 1,207.71 and 572.78

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Solution

The fourth proportional to 802.30, 1,207.71 and 572.78 is: 862.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.30 : 1,207.71 = 572.78 : x
  2. Step 2: Convert to fraction form
    802.30/1,207.71 = 572.78/x
  3. Step 3: Cross multiply
    802.30x = 1,207.71 × 572.78
  4. Step 4: Simplify right side
    802.30x = 691,746.10
  5. Step 5: Solve for x
    x = 691,746.10/802.30
  6. Step 6: Final answer
    x = 862.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.