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Finding the Fourth Proportional to 78,757,866.62, 118,136,799.84 and 21,250,137.74

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Solution

The fourth proportional to 78,757,866.62, 118,136,799.84 and 21,250,137.74 is: 31,875,206.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,757,866.62 : 118,136,799.84 = 21,250,137.74 : x
  2. Step 2: Convert to fraction form
    78,757,866.62/118,136,799.84 = 21,250,137.74/x
  3. Step 3: Cross multiply
    78,757,866.62x = 118,136,799.84 × 21,250,137.74
  4. Step 4: Simplify right side
    78,757,866.62x = 2,510,423,268,762,810
  5. Step 5: Solve for x
    x = 2,510,423,268,762,810/78,757,866.62
  6. Step 6: Final answer
    x = 31,875,206.59

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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.