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Finding the Fourth Proportional to 922.10, 1,372.91 and 909.18

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Solution

The fourth proportional to 922.10, 1,372.91 and 909.18 is: 1,353.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.10 : 1,372.91 = 909.18 : x
  2. Step 2: Convert to fraction form
    922.10/1,372.91 = 909.18/x
  3. Step 3: Cross multiply
    922.10x = 1,372.91 × 909.18
  4. Step 4: Simplify right side
    922.10x = 1,248,217.77
  5. Step 5: Solve for x
    x = 1,248,217.77/922.10
  6. Step 6: Final answer
    x = 1,353.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.