Home / 129,421.76-178,559.20-105,507.20

Finding the Fourth Proportional to 129,421.76, 178,559.20 and 105,507.20

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Solution

The fourth proportional to 129,421.76, 178,559.20 and 105,507.20 is: 145,565.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,421.76 : 178,559.20 = 105,507.20 : x
  2. Step 2: Convert to fraction form
    129,421.76/178,559.20 = 105,507.20/x
  3. Step 3: Cross multiply
    129,421.76x = 178,559.20 × 105,507.20
  4. Step 4: Simplify right side
    129,421.76x = 18,839,281,226.24
  5. Step 5: Solve for x
    x = 18,839,281,226.24/129,421.76
  6. Step 6: Final answer
    x = 145,565.02

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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.