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Finding the Fourth Proportional to 387,280.80, 580,921.20 and 216,038.70

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Solution

The fourth proportional to 387,280.80, 580,921.20 and 216,038.70 is: 324,058.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,280.80 : 580,921.20 = 216,038.70 : x
  2. Step 2: Convert to fraction form
    387,280.80/580,921.20 = 216,038.70/x
  3. Step 3: Cross multiply
    387,280.80x = 580,921.20 × 216,038.70
  4. Step 4: Simplify right side
    387,280.80x = 125,501,460,850.44
  5. Step 5: Solve for x
    x = 125,501,460,850.44/387,280.80
  6. Step 6: Final answer
    x = 324,058.05

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Similar ratio
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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.