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Finding the Fourth Proportional to 79,213.78, 109,315 and 47,390.16

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Solution

The fourth proportional to 79,213.78, 109,315 and 47,390.16 is: 65,398.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,213.78 : 109,315 = 47,390.16 : x
  2. Step 2: Convert to fraction form
    79,213.78/109,315 = 47,390.16/x
  3. Step 3: Cross multiply
    79,213.78x = 109,315 × 47,390.16
  4. Step 4: Simplify right side
    79,213.78x = 5,180,455,340.40
  5. Step 5: Solve for x
    x = 5,180,455,340.40/79,213.78
  6. Step 6: Final answer
    x = 65,398.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.