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Finding the Fourth Proportional to 390,160.56, 585,279.78 and 105,855.57

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Solution

The fourth proportional to 390,160.56, 585,279.78 and 105,855.57 is: 158,793.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,160.56 : 585,279.78 = 105,855.57 : x
  2. Step 2: Convert to fraction form
    390,160.56/585,279.78 = 105,855.57/x
  3. Step 3: Cross multiply
    390,160.56x = 585,279.78 × 105,855.57
  4. Step 4: Simplify right side
    390,160.56x = 61,955,124,721.37
  5. Step 5: Solve for x
    x = 61,955,124,721.37/390,160.56
  6. Step 6: Final answer
    x = 158,793.92

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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.