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Finding the Fourth Proportional to 66,405,939.60, 99,608,909.40 and 48,124,369.20

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Solution

The fourth proportional to 66,405,939.60, 99,608,909.40 and 48,124,369.20 is: 72,186,553.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,405,939.60 : 99,608,909.40 = 48,124,369.20 : x
  2. Step 2: Convert to fraction form
    66,405,939.60/99,608,909.40 = 48,124,369.20/x
  3. Step 3: Cross multiply
    66,405,939.60x = 99,608,909.40 × 48,124,369.20
  4. Step 4: Simplify right side
    66,405,939.60x = 4,793,615,931,574,951
  5. Step 5: Solve for x
    x = 4,793,615,931,574,951/66,405,939.60
  6. Step 6: Final answer
    x = 72,186,553.80

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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.