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Finding the Fourth Proportional to 80,642,641.60, 120,963,962.40 and 72,328,542.40

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Solution

The fourth proportional to 80,642,641.60, 120,963,962.40 and 72,328,542.40 is: 108,492,813.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,642,641.60 : 120,963,962.40 = 72,328,542.40 : x
  2. Step 2: Convert to fraction form
    80,642,641.60/120,963,962.40 = 72,328,542.40/x
  3. Step 3: Cross multiply
    80,642,641.60x = 120,963,962.40 × 72,328,542.40
  4. Step 4: Simplify right side
    80,642,641.60x = 8,749,147,083,320,407
  5. Step 5: Solve for x
    x = 8,749,147,083,320,407/80,642,641.60
  6. Step 6: Final answer
    x = 108,492,813.60

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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.