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Finding the Fourth Proportional to 391,911.25, 586,869.74 and 258,386.39

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Solution

The fourth proportional to 391,911.25, 586,869.74 and 258,386.39 is: 386,922.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,911.25 : 586,869.74 = 258,386.39 : x
  2. Step 2: Convert to fraction form
    391,911.25/586,869.74 = 258,386.39/x
  3. Step 3: Cross multiply
    391,911.25x = 586,869.74 × 258,386.39
  4. Step 4: Simplify right side
    391,911.25x = 151,639,152,226.91
  5. Step 5: Solve for x
    x = 151,639,152,226.91/391,911.25
  6. Step 6: Final answer
    x = 386,922.18

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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.