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Finding the Fourth Proportional to 128,813.91, 177,766.70 and 72,224.07

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Solution

The fourth proportional to 128,813.91, 177,766.70 and 72,224.07 is: 99,671.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,813.91 : 177,766.70 = 72,224.07 : x
  2. Step 2: Convert to fraction form
    128,813.91/177,766.70 = 72,224.07/x
  3. Step 3: Cross multiply
    128,813.91x = 177,766.70 × 72,224.07
  4. Step 4: Simplify right side
    128,813.91x = 12,839,034,223.35
  5. Step 5: Solve for x
    x = 12,839,034,223.35/128,813.91
  6. Step 6: Final answer
    x = 99,671.18

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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.