Home / 128,442.12-177,285.78-74,737.55

Finding the Fourth Proportional to 128,442.12, 177,285.78 and 74,737.55

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Solution

The fourth proportional to 128,442.12, 177,285.78 and 74,737.55 is: 103,158.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,442.12 : 177,285.78 = 74,737.55 : x
  2. Step 2: Convert to fraction form
    128,442.12/177,285.78 = 74,737.55/x
  3. Step 3: Cross multiply
    128,442.12x = 177,285.78 × 74,737.55
  4. Step 4: Simplify right side
    128,442.12x = 13,249,903,960.61
  5. Step 5: Solve for x
    x = 13,249,903,960.61/128,442.12
  6. Step 6: Final answer
    x = 103,158.56

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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.