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Finding the Fourth Proportional to 66,986,428.80, 100,479,643.20 and 64,152,076.80

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Solution

The fourth proportional to 66,986,428.80, 100,479,643.20 and 64,152,076.80 is: 96,228,115.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,986,428.80 : 100,479,643.20 = 64,152,076.80 : x
  2. Step 2: Convert to fraction form
    66,986,428.80/100,479,643.20 = 64,152,076.80/x
  3. Step 3: Cross multiply
    66,986,428.80x = 100,479,643.20 × 64,152,076.80
  4. Step 4: Simplify right side
    66,986,428.80x = 6,445,977,787,402,998
  5. Step 5: Solve for x
    x = 6,445,977,787,402,998/66,986,428.80
  6. Step 6: Final answer
    x = 96,228,115.20

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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.