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Finding the Fourth Proportional to 402.18, 602.98 and 128.12

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Solution

The fourth proportional to 402.18, 602.98 and 128.12 is: 192.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.18 : 602.98 = 128.12 : x
  2. Step 2: Convert to fraction form
    402.18/602.98 = 128.12/x
  3. Step 3: Cross multiply
    402.18x = 602.98 × 128.12
  4. Step 4: Simplify right side
    402.18x = 77,250.46
  5. Step 5: Solve for x
    x = 77,250.46/402.18
  6. Step 6: Final answer
    x = 192.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.