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Finding the Fourth Proportional to 315,135.13, 472,630.70 and 90,493.78

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Solution

The fourth proportional to 315,135.13, 472,630.70 and 90,493.78 is: 135,720.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,135.13 : 472,630.70 = 90,493.78 : x
  2. Step 2: Convert to fraction form
    315,135.13/472,630.70 = 90,493.78/x
  3. Step 3: Cross multiply
    315,135.13x = 472,630.70 × 90,493.78
  4. Step 4: Simplify right side
    315,135.13x = 42,770,138,587.05
  5. Step 5: Solve for x
    x = 42,770,138,587.05/315,135.13
  6. Step 6: Final answer
    x = 135,720.00

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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.