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Finding the Fourth Proportional to 386,908.80, 580,363.20 and 292,430.40

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Solution

The fourth proportional to 386,908.80, 580,363.20 and 292,430.40 is: 438,645.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,908.80 : 580,363.20 = 292,430.40 : x
  2. Step 2: Convert to fraction form
    386,908.80/580,363.20 = 292,430.40/x
  3. Step 3: Cross multiply
    386,908.80x = 580,363.20 × 292,430.40
  4. Step 4: Simplify right side
    386,908.80x = 169,715,842,721.28
  5. Step 5: Solve for x
    x = 169,715,842,721.28/386,908.80
  6. Step 6: Final answer
    x = 438,645.60

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1.5x scale

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.