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Finding the Fourth Proportional to 118,679,842.80, 178,019,764.20 and 72,763,340.40

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Solution

The fourth proportional to 118,679,842.80, 178,019,764.20 and 72,763,340.40 is: 109,145,010.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,679,842.80 : 178,019,764.20 = 72,763,340.40 : x
  2. Step 2: Convert to fraction form
    118,679,842.80/178,019,764.20 = 72,763,340.40/x
  3. Step 3: Cross multiply
    118,679,842.80x = 178,019,764.20 × 72,763,340.40
  4. Step 4: Simplify right side
    118,679,842.80x = 12,953,312,700,412,334
  5. Step 5: Solve for x
    x = 12,953,312,700,412,334/118,679,842.80
  6. Step 6: Final answer
    x = 109,145,010.60

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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.