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Finding the Fourth Proportional to 261,036.45, 391,036.28 and 155,542.05

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Solution

The fourth proportional to 261,036.45, 391,036.28 and 155,542.05 is: 233,004.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,036.45 : 391,036.28 = 155,542.05 : x
  2. Step 2: Convert to fraction form
    261,036.45/391,036.28 = 155,542.05/x
  3. Step 3: Cross multiply
    261,036.45x = 391,036.28 × 155,542.05
  4. Step 4: Simplify right side
    261,036.45x = 60,822,583,837.86
  5. Step 5: Solve for x
    x = 60,822,583,837.86/261,036.45
  6. Step 6: Final answer
    x = 233,004.18

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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.