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Finding the Fourth Proportional to 1,042.60, 1,572.17 and 929.20

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Solution

The fourth proportional to 1,042.60, 1,572.17 and 929.20 is: 1,401.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.60 : 1,572.17 = 929.20 : x
  2. Step 2: Convert to fraction form
    1,042.60/1,572.17 = 929.20/x
  3. Step 3: Cross multiply
    1,042.60x = 1,572.17 × 929.20
  4. Step 4: Simplify right side
    1,042.60x = 1,460,860.36
  5. Step 5: Solve for x
    x = 1,460,860.36/1,042.60
  6. Step 6: Final answer
    x = 1,401.17

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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.