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Finding the Fourth Proportional to 386,430.80, 579,646.20 and 342,885.20

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Solution

The fourth proportional to 386,430.80, 579,646.20 and 342,885.20 is: 514,327.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,430.80 : 579,646.20 = 342,885.20 : x
  2. Step 2: Convert to fraction form
    386,430.80/579,646.20 = 342,885.20/x
  3. Step 3: Cross multiply
    386,430.80x = 579,646.20 × 342,885.20
  4. Step 4: Simplify right side
    386,430.80x = 198,752,103,216.24
  5. Step 5: Solve for x
    x = 198,752,103,216.24/386,430.80
  6. Step 6: Final answer
    x = 514,327.80

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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.