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Finding the Fourth Proportional to 402.47, 555.61 and 378.17

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Solution

The fourth proportional to 402.47, 555.61 and 378.17 is: 522.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.47 : 555.61 = 378.17 : x
  2. Step 2: Convert to fraction form
    402.47/555.61 = 378.17/x
  3. Step 3: Cross multiply
    402.47x = 555.61 × 378.17
  4. Step 4: Simplify right side
    402.47x = 210,114.10
  5. Step 5: Solve for x
    x = 210,114.10/402.47
  6. Step 6: Final answer
    x = 522.06

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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.