Home / 103,639.10-155,458.65-72,146.30

Finding the Fourth Proportional to 103,639.10, 155,458.65 and 72,146.30

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Solution

The fourth proportional to 103,639.10, 155,458.65 and 72,146.30 is: 108,219.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,639.10 : 155,458.65 = 72,146.30 : x
  2. Step 2: Convert to fraction form
    103,639.10/155,458.65 = 72,146.30/x
  3. Step 3: Cross multiply
    103,639.10x = 155,458.65 × 72,146.30
  4. Step 4: Simplify right side
    103,639.10x = 11,215,766,400.50
  5. Step 5: Solve for x
    x = 11,215,766,400.50/103,639.10
  6. Step 6: Final answer
    x = 108,219.45

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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.