Home / 129,298.64-178,436.39-78,320.88

Finding the Fourth Proportional to 129,298.64, 178,436.39 and 78,320.88

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Solution

The fourth proportional to 129,298.64, 178,436.39 and 78,320.88 is: 108,085.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,298.64 : 178,436.39 = 78,320.88 : x
  2. Step 2: Convert to fraction form
    129,298.64/178,436.39 = 78,320.88/x
  3. Step 3: Cross multiply
    129,298.64x = 178,436.39 × 78,320.88
  4. Step 4: Simplify right side
    129,298.64x = 13,975,294,697.22
  5. Step 5: Solve for x
    x = 13,975,294,697.22/129,298.64
  6. Step 6: Final answer
    x = 108,085.40

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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.