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Finding the Fourth Proportional to 261,339.60, 392,139 and 103,564.56

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Solution

The fourth proportional to 261,339.60, 392,139 and 103,564.56 is: 155,398.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,339.60 : 392,139 = 103,564.56 : x
  2. Step 2: Convert to fraction form
    261,339.60/392,139 = 103,564.56/x
  3. Step 3: Cross multiply
    261,339.60x = 392,139 × 103,564.56
  4. Step 4: Simplify right side
    261,339.60x = 40,611,702,993.84
  5. Step 5: Solve for x
    x = 40,611,702,993.84/261,339.60
  6. Step 6: Final answer
    x = 155,398.20

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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.