Home / 129,437.44-178,678.78-87,020.58

Finding the Fourth Proportional to 129,437.44, 178,678.78 and 87,020.58

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Solution

The fourth proportional to 129,437.44, 178,678.78 and 87,020.58 is: 120,125.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,437.44 : 178,678.78 = 87,020.58 : x
  2. Step 2: Convert to fraction form
    129,437.44/178,678.78 = 87,020.58/x
  3. Step 3: Cross multiply
    129,437.44x = 178,678.78 × 87,020.58
  4. Step 4: Simplify right side
    129,437.44x = 15,548,731,069.29
  5. Step 5: Solve for x
    x = 15,548,731,069.29/129,437.44
  6. Step 6: Final answer
    x = 120,125.45

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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.