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Finding the Fourth Proportional to 630.17, 870.04 and 406.21

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Solution

The fourth proportional to 630.17, 870.04 and 406.21 is: 560.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.17 : 870.04 = 406.21 : x
  2. Step 2: Convert to fraction form
    630.17/870.04 = 406.21/x
  3. Step 3: Cross multiply
    630.17x = 870.04 × 406.21
  4. Step 4: Simplify right side
    630.17x = 353,418.95
  5. Step 5: Solve for x
    x = 353,418.95/630.17
  6. Step 6: Final answer
    x = 560.83

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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.