Home / 129,437.12-178,629.60-72,854.72

Finding the Fourth Proportional to 129,437.12, 178,629.60 and 72,854.72

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Solution

The fourth proportional to 129,437.12, 178,629.60 and 72,854.72 is: 100,543.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,437.12 : 178,629.60 = 72,854.72 : x
  2. Step 2: Convert to fraction form
    129,437.12/178,629.60 = 72,854.72/x
  3. Step 3: Cross multiply
    129,437.12x = 178,629.60 × 72,854.72
  4. Step 4: Simplify right side
    129,437.12x = 13,014,009,491.71
  5. Step 5: Solve for x
    x = 13,014,009,491.71/129,437.12
  6. Step 6: Final answer
    x = 100,543.10

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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.