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Finding the Fourth Proportional to 315,805.12, 473,649.60 and 138,279.04

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Solution

The fourth proportional to 315,805.12, 473,649.60 and 138,279.04 is: 207,393.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,805.12 : 473,649.60 = 138,279.04 : x
  2. Step 2: Convert to fraction form
    315,805.12/473,649.60 = 138,279.04/x
  3. Step 3: Cross multiply
    315,805.12x = 473,649.60 × 138,279.04
  4. Step 4: Simplify right side
    315,805.12x = 65,495,811,984.38
  5. Step 5: Solve for x
    x = 65,495,811,984.38/315,805.12
  6. Step 6: Final answer
    x = 207,393.13

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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.