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Finding the Fourth Proportional to 885.14, 1,325.90 and 421.52

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Solution

The fourth proportional to 885.14, 1,325.90 and 421.52 is: 631.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.14 : 1,325.90 = 421.52 : x
  2. Step 2: Convert to fraction form
    885.14/1,325.90 = 421.52/x
  3. Step 3: Cross multiply
    885.14x = 1,325.90 × 421.52
  4. Step 4: Simplify right side
    885.14x = 558,886.74
  5. Step 5: Solve for x
    x = 558,886.74/885.14
  6. Step 6: Final answer
    x = 631.41

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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.