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Finding the Fourth Proportional to 76,996,811.70, 115,495,217.55 and 71,894,978.10

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Solution

The fourth proportional to 76,996,811.70, 115,495,217.55 and 71,894,978.10 is: 107,842,467.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,996,811.70 : 115,495,217.55 = 71,894,978.10 : x
  2. Step 2: Convert to fraction form
    76,996,811.70/115,495,217.55 = 71,894,978.10/x
  3. Step 3: Cross multiply
    76,996,811.70x = 115,495,217.55 × 71,894,978.10
  4. Step 4: Simplify right side
    76,996,811.70x = 8,303,526,136,411,985
  5. Step 5: Solve for x
    x = 8,303,526,136,411,985/76,996,811.70
  6. Step 6: Final answer
    x = 107,842,467.15

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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.