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Finding the Fourth Proportional to 66,438.80, 99,658.20 and 45,443.60

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Solution

The fourth proportional to 66,438.80, 99,658.20 and 45,443.60 is: 68,165.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,438.80 : 99,658.20 = 45,443.60 : x
  2. Step 2: Convert to fraction form
    66,438.80/99,658.20 = 45,443.60/x
  3. Step 3: Cross multiply
    66,438.80x = 99,658.20 × 45,443.60
  4. Step 4: Simplify right side
    66,438.80x = 4,528,827,377.52
  5. Step 5: Solve for x
    x = 4,528,827,377.52/66,438.80
  6. Step 6: Final answer
    x = 68,165.40

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1.5x scale

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.