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Finding the Fourth Proportional to 261,987.84, 392,943.42 and 128,832.30

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Solution

The fourth proportional to 261,987.84, 392,943.42 and 128,832.30 is: 193,229.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,987.84 : 392,943.42 = 128,832.30 : x
  2. Step 2: Convert to fraction form
    261,987.84/392,943.42 = 128,832.30/x
  3. Step 3: Cross multiply
    261,987.84x = 392,943.42 × 128,832.30
  4. Step 4: Simplify right side
    261,987.84x = 50,623,804,568.47
  5. Step 5: Solve for x
    x = 50,623,804,568.47/261,987.84
  6. Step 6: Final answer
    x = 193,229.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.