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Finding the Fourth Proportional to 25,658.60, 38,487.48 and 8,128.40

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Solution

The fourth proportional to 25,658.60, 38,487.48 and 8,128.40 is: 12,192.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,658.60 : 38,487.48 = 8,128.40 : x
  2. Step 2: Convert to fraction form
    25,658.60/38,487.48 = 8,128.40/x
  3. Step 3: Cross multiply
    25,658.60x = 38,487.48 × 8,128.40
  4. Step 4: Simplify right side
    25,658.60x = 312,841,632.43
  5. Step 5: Solve for x
    x = 312,841,632.43/25,658.60
  6. Step 6: Final answer
    x = 12,192.47

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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.