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Finding the Fourth Proportional to 15,781.60, 23,672.40 and 5,921.20

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Solution

The fourth proportional to 15,781.60, 23,672.40 and 5,921.20 is: 8,881.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.60 : 23,672.40 = 5,921.20 : x
  2. Step 2: Convert to fraction form
    15,781.60/23,672.40 = 5,921.20/x
  3. Step 3: Cross multiply
    15,781.60x = 23,672.40 × 5,921.20
  4. Step 4: Simplify right side
    15,781.60x = 140,169,014.88
  5. Step 5: Solve for x
    x = 140,169,014.88/15,781.60
  6. Step 6: Final answer
    x = 8,881.80

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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.