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Finding the Fourth Proportional to 18,578,710.80, 27,868,066.20 and 12,121,702.65

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Solution

The fourth proportional to 18,578,710.80, 27,868,066.20 and 12,121,702.65 is: 18,182,553.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,578,710.80 : 27,868,066.20 = 12,121,702.65 : x
  2. Step 2: Convert to fraction form
    18,578,710.80/27,868,066.20 = 12,121,702.65/x
  3. Step 3: Cross multiply
    18,578,710.80x = 27,868,066.20 × 12,121,702.65
  4. Step 4: Simplify right side
    18,578,710.80x = 337,808,411,906,915.44
  5. Step 5: Solve for x
    x = 337,808,411,906,915.44/18,578,710.80
  6. Step 6: Final answer
    x = 18,182,553.98

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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.