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Finding the Fourth Proportional to 386,425.80, 579,638.70 and 342,880.20

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Solution

The fourth proportional to 386,425.80, 579,638.70 and 342,880.20 is: 514,320.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,425.80 : 579,638.70 = 342,880.20 : x
  2. Step 2: Convert to fraction form
    386,425.80/579,638.70 = 342,880.20/x
  3. Step 3: Cross multiply
    386,425.80x = 579,638.70 × 342,880.20
  4. Step 4: Simplify right side
    386,425.80x = 198,746,633,383.74
  5. Step 5: Solve for x
    x = 198,746,633,383.74/386,425.80
  6. Step 6: Final answer
    x = 514,320.30

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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.