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Finding the Fourth Proportional to 21,276,905.70, 31,915,358.55 and 21,276,905.70

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Solution

The fourth proportional to 21,276,905.70, 31,915,358.55 and 21,276,905.70 is: 31,915,358.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,276,905.70 : 31,915,358.55 = 21,276,905.70 : x
  2. Step 2: Convert to fraction form
    21,276,905.70/31,915,358.55 = 21,276,905.70/x
  3. Step 3: Cross multiply
    21,276,905.70x = 31,915,358.55 × 21,276,905.70
  4. Step 4: Simplify right side
    21,276,905.70x = 679,060,074,250,038.75
  5. Step 5: Solve for x
    x = 679,060,074,250,038.75/21,276,905.70
  6. Step 6: Final answer
    x = 31,915,358.55

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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.