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Finding the Fourth Proportional to 66,862,978.28, 100,295,239.59 and 20,176,868.52

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Solution

The fourth proportional to 66,862,978.28, 100,295,239.59 and 20,176,868.52 is: 30,265,535.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,862,978.28 : 100,295,239.59 = 20,176,868.52 : x
  2. Step 2: Convert to fraction form
    66,862,978.28/100,295,239.59 = 20,176,868.52/x
  3. Step 3: Cross multiply
    66,862,978.28x = 100,295,239.59 × 20,176,868.52
  4. Step 4: Simplify right side
    66,862,978.28x = 2,023,643,862,389,328.75
  5. Step 5: Solve for x
    x = 2,023,643,862,389,328.75/66,862,978.28
  6. Step 6: Final answer
    x = 30,265,535.80

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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.