Home / 21,002,915.60-31,441,387.80-12,478,864.40

Finding the Fourth Proportional to 21,002,915.60, 31,441,387.80 and 12,478,864.40

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Solution

The fourth proportional to 21,002,915.60, 31,441,387.80 and 12,478,864.40 is: 18,680,873.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,002,915.60 : 31,441,387.80 = 12,478,864.40 : x
  2. Step 2: Convert to fraction form
    21,002,915.60/31,441,387.80 = 12,478,864.40/x
  3. Step 3: Cross multiply
    21,002,915.60x = 31,441,387.80 × 12,478,864.40
  4. Step 4: Simplify right side
    21,002,915.60x = 392,352,814,904,014.31
  5. Step 5: Solve for x
    x = 392,352,814,904,014.31/21,002,915.60
  6. Step 6: Final answer
    x = 18,680,873.76

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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.