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Finding the Fourth Proportional to 386,431.80, 579,647.70 and 342,886.20

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Solution

The fourth proportional to 386,431.80, 579,647.70 and 342,886.20 is: 514,329.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,431.80 : 579,647.70 = 342,886.20 : x
  2. Step 2: Convert to fraction form
    386,431.80/579,647.70 = 342,886.20/x
  3. Step 3: Cross multiply
    386,431.80x = 579,647.70 × 342,886.20
  4. Step 4: Simplify right side
    386,431.80x = 198,753,197,191.74
  5. Step 5: Solve for x
    x = 198,753,197,191.74/386,431.80
  6. Step 6: Final answer
    x = 514,329.30

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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.