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Finding the Fourth Proportional to 128,640, 177,523.20 and 72,051.24

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Solution

The fourth proportional to 128,640, 177,523.20 and 72,051.24 is: 99,430.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,640 : 177,523.20 = 72,051.24 : x
  2. Step 2: Convert to fraction form
    128,640/177,523.20 = 72,051.24/x
  3. Step 3: Cross multiply
    128,640x = 177,523.20 × 72,051.24
  4. Step 4: Simplify right side
    128,640x = 12,790,766,688.77
  5. Step 5: Solve for x
    x = 12,790,766,688.77/128,640
  6. Step 6: Final answer
    x = 99,430.71

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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.