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Finding the Fourth Proportional to 386,306.68, 579,626.52 and 208,938.55

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Solution

The fourth proportional to 386,306.68, 579,626.52 and 208,938.55 is: 313,497.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,306.68 : 579,626.52 = 208,938.55 : x
  2. Step 2: Convert to fraction form
    386,306.68/579,626.52 = 208,938.55/x
  3. Step 3: Cross multiply
    386,306.68x = 579,626.52 × 208,938.55
  4. Step 4: Simplify right side
    386,306.68x = 121,106,322,397.76
  5. Step 5: Solve for x
    x = 121,106,322,397.76/386,306.68
  6. Step 6: Final answer
    x = 313,497.87

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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.