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Finding the Fourth Proportional to 890.90, 1,337.95 and 862.10

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Solution

The fourth proportional to 890.90, 1,337.95 and 862.10 is: 1,294.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.90 : 1,337.95 = 862.10 : x
  2. Step 2: Convert to fraction form
    890.90/1,337.95 = 862.10/x
  3. Step 3: Cross multiply
    890.90x = 1,337.95 × 862.10
  4. Step 4: Simplify right side
    890.90x = 1,153,446.70
  5. Step 5: Solve for x
    x = 1,153,446.70/890.90
  6. Step 6: Final answer
    x = 1,294.70

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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.