Home / 129,354.12-178,506.68-72,765.45

Finding the Fourth Proportional to 129,354.12, 178,506.68 and 72,765.45

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Solution

The fourth proportional to 129,354.12, 178,506.68 and 72,765.45 is: 100,415.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,354.12 : 178,506.68 = 72,765.45 : x
  2. Step 2: Convert to fraction form
    129,354.12/178,506.68 = 72,765.45/x
  3. Step 3: Cross multiply
    129,354.12x = 178,506.68 × 72,765.45
  4. Step 4: Simplify right side
    129,354.12x = 12,989,118,534.38
  5. Step 5: Solve for x
    x = 12,989,118,534.38/129,354.12
  6. Step 6: Final answer
    x = 100,415.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.