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Finding the Fourth Proportional to 261,428.20, 392,531.10 and 202,330.60

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Solution

The fourth proportional to 261,428.20, 392,531.10 and 202,330.60 is: 303,796.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,428.20 : 392,531.10 = 202,330.60 : x
  2. Step 2: Convert to fraction form
    261,428.20/392,531.10 = 202,330.60/x
  3. Step 3: Cross multiply
    261,428.20x = 392,531.10 × 202,330.60
  4. Step 4: Simplify right side
    261,428.20x = 79,421,052,981.66
  5. Step 5: Solve for x
    x = 79,421,052,981.66/261,428.20
  6. Step 6: Final answer
    x = 303,796.81

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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.