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Finding the Fourth Proportional to 136,920.60, 189,079.70 and 129,465.60

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Solution

The fourth proportional to 136,920.60, 189,079.70 and 129,465.60 is: 178,784.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,920.60 : 189,079.70 = 129,465.60 : x
  2. Step 2: Convert to fraction form
    136,920.60/189,079.70 = 129,465.60/x
  3. Step 3: Cross multiply
    136,920.60x = 189,079.70 × 129,465.60
  4. Step 4: Simplify right side
    136,920.60x = 24,479,316,808.32
  5. Step 5: Solve for x
    x = 24,479,316,808.32/136,920.60
  6. Step 6: Final answer
    x = 178,784.76

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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.