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Finding the Fourth Proportional to 1,006.34, 1,509.01 and 421.17

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Solution

The fourth proportional to 1,006.34, 1,509.01 and 421.17 is: 631.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.34 : 1,509.01 = 421.17 : x
  2. Step 2: Convert to fraction form
    1,006.34/1,509.01 = 421.17/x
  3. Step 3: Cross multiply
    1,006.34x = 1,509.01 × 421.17
  4. Step 4: Simplify right side
    1,006.34x = 635,545.40
  5. Step 5: Solve for x
    x = 635,545.40/1,006.34
  6. Step 6: Final answer
    x = 631.54

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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.