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Finding the Fourth Proportional to 15,657.62, 21,601.98 and 8,938.40

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Solution

The fourth proportional to 15,657.62, 21,601.98 and 8,938.40 is: 12,331.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,657.62 : 21,601.98 = 8,938.40 : x
  2. Step 2: Convert to fraction form
    15,657.62/21,601.98 = 8,938.40/x
  3. Step 3: Cross multiply
    15,657.62x = 21,601.98 × 8,938.40
  4. Step 4: Simplify right side
    15,657.62x = 193,087,138.03
  5. Step 5: Solve for x
    x = 193,087,138.03/15,657.62
  6. Step 6: Final answer
    x = 12,331.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.