Home / 128,686.52-177,594.66-72,116.12

Finding the Fourth Proportional to 128,686.52, 177,594.66 and 72,116.12

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Solution

The fourth proportional to 128,686.52, 177,594.66 and 72,116.12 is: 99,524.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,686.52 : 177,594.66 = 72,116.12 : x
  2. Step 2: Convert to fraction form
    128,686.52/177,594.66 = 72,116.12/x
  3. Step 3: Cross multiply
    128,686.52x = 177,594.66 × 72,116.12
  4. Step 4: Simplify right side
    128,686.52x = 12,807,437,811.92
  5. Step 5: Solve for x
    x = 12,807,437,811.92/128,686.52
  6. Step 6: Final answer
    x = 99,524.32

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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.