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Finding the Fourth Proportional to 15,853,866.50, 21,877,603.61 and 8,978,397.78

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Solution

The fourth proportional to 15,853,866.50, 21,877,603.61 and 8,978,397.78 is: 12,389,774.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,853,866.50 : 21,877,603.61 = 8,978,397.78 : x
  2. Step 2: Convert to fraction form
    15,853,866.50/21,877,603.61 = 8,978,397.78/x
  3. Step 3: Cross multiply
    15,853,866.50x = 21,877,603.61 × 8,978,397.78
  4. Step 4: Simplify right side
    15,853,866.50x = 196,425,827,683,743.97
  5. Step 5: Solve for x
    x = 196,425,827,683,743.97/15,853,866.50
  6. Step 6: Final answer
    x = 12,389,774.30

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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.