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Finding the Fourth Proportional to 145,156,978.60, 217,593,750.30 and 129,851,477.80

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Solution

The fourth proportional to 145,156,978.60, 217,593,750.30 and 129,851,477.80 is: 194,650,441.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,156,978.60 : 217,593,750.30 = 129,851,477.80 : x
  2. Step 2: Convert to fraction form
    145,156,978.60/217,593,750.30 = 129,851,477.80/x
  3. Step 3: Cross multiply
    145,156,978.60x = 217,593,750.30 × 129,851,477.80
  4. Step 4: Simplify right side
    145,156,978.60x = 28,254,870,036,499,196
  5. Step 5: Solve for x
    x = 28,254,870,036,499,196/145,156,978.60
  6. Step 6: Final answer
    x = 194,650,441.95

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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.