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Finding the Fourth Proportional to 128,851.32, 177,814.64 and 72,262.20

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Solution

The fourth proportional to 128,851.32, 177,814.64 and 72,262.20 is: 99,721.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,851.32 : 177,814.64 = 72,262.20 : x
  2. Step 2: Convert to fraction form
    128,851.32/177,814.64 = 72,262.20/x
  3. Step 3: Cross multiply
    128,851.32x = 177,814.64 × 72,262.20
  4. Step 4: Simplify right side
    128,851.32x = 12,849,277,078.61
  5. Step 5: Solve for x
    x = 12,849,277,078.61/128,851.32
  6. Step 6: Final answer
    x = 99,721.73

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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.