Home / 128,386.60-177,168.18-74,671.72

Finding the Fourth Proportional to 128,386.60, 177,168.18 and 74,671.72

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Solution

The fourth proportional to 128,386.60, 177,168.18 and 74,671.72 is: 103,043.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,386.60 : 177,168.18 = 74,671.72 : x
  2. Step 2: Convert to fraction form
    128,386.60/177,168.18 = 74,671.72/x
  3. Step 3: Cross multiply
    128,386.60x = 177,168.18 × 74,671.72
  4. Step 4: Simplify right side
    128,386.60x = 13,229,452,729.87
  5. Step 5: Solve for x
    x = 13,229,452,729.87/128,386.60
  6. Step 6: Final answer
    x = 103,043.87

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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.