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Finding the Fourth Proportional to 21,391.70, 32,073.98 and 8,920.13

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Solution

The fourth proportional to 21,391.70, 32,073.98 and 8,920.13 is: 13,374.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,391.70 : 32,073.98 = 8,920.13 : x
  2. Step 2: Convert to fraction form
    21,391.70/32,073.98 = 8,920.13/x
  3. Step 3: Cross multiply
    21,391.70x = 32,073.98 × 8,920.13
  4. Step 4: Simplify right side
    21,391.70x = 286,103,866.25
  5. Step 5: Solve for x
    x = 286,103,866.25/21,391.70
  6. Step 6: Final answer
    x = 13,374.53

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1.5x scale

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.