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Finding the Fourth Proportional to 74,979.40, 112,469.10 and 30,591.40

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Solution

The fourth proportional to 74,979.40, 112,469.10 and 30,591.40 is: 45,887.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,979.40 : 112,469.10 = 30,591.40 : x
  2. Step 2: Convert to fraction form
    74,979.40/112,469.10 = 30,591.40/x
  3. Step 3: Cross multiply
    74,979.40x = 112,469.10 × 30,591.40
  4. Step 4: Simplify right side
    74,979.40x = 3,440,587,225.74
  5. Step 5: Solve for x
    x = 3,440,587,225.74/74,979.40
  6. Step 6: Final answer
    x = 45,887.10

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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.