Home / 103,639.20-155,458.80-66,314.40

Finding the Fourth Proportional to 103,639.20, 155,458.80 and 66,314.40

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Solution

The fourth proportional to 103,639.20, 155,458.80 and 66,314.40 is: 99,471.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,639.20 : 155,458.80 = 66,314.40 : x
  2. Step 2: Convert to fraction form
    103,639.20/155,458.80 = 66,314.40/x
  3. Step 3: Cross multiply
    103,639.20x = 155,458.80 × 66,314.40
  4. Step 4: Simplify right side
    103,639.20x = 10,309,157,046.72
  5. Step 5: Solve for x
    x = 10,309,157,046.72/103,639.20
  6. Step 6: Final answer
    x = 99,471.60

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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.