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Finding the Fourth Proportional to 261,905.40, 392,760.90 and 104,101.20

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Solution

The fourth proportional to 261,905.40, 392,760.90 and 104,101.20 is: 156,113.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,905.40 : 392,760.90 = 104,101.20 : x
  2. Step 2: Convert to fraction form
    261,905.40/392,760.90 = 104,101.20/x
  3. Step 3: Cross multiply
    261,905.40x = 392,760.90 × 104,101.20
  4. Step 4: Simplify right side
    261,905.40x = 40,886,881,003.08
  5. Step 5: Solve for x
    x = 40,886,881,003.08/261,905.40
  6. Step 6: Final answer
    x = 156,113.17

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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.