Home / 128,520.48-177,360.66-71,931.72

Finding the Fourth Proportional to 128,520.48, 177,360.66 and 71,931.72

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Solution

The fourth proportional to 128,520.48, 177,360.66 and 71,931.72 is: 99,267.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,520.48 : 177,360.66 = 71,931.72 : x
  2. Step 2: Convert to fraction form
    128,520.48/177,360.66 = 71,931.72/x
  3. Step 3: Cross multiply
    128,520.48x = 177,360.66 × 71,931.72
  4. Step 4: Simplify right side
    128,520.48x = 12,757,857,334.14
  5. Step 5: Solve for x
    x = 12,757,857,334.14/128,520.48
  6. Step 6: Final answer
    x = 99,267.12

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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.