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Finding the Fourth Proportional to 85,319.40, 127,979.10 and 81,863.40

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Solution

The fourth proportional to 85,319.40, 127,979.10 and 81,863.40 is: 122,795.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,319.40 : 127,979.10 = 81,863.40 : x
  2. Step 2: Convert to fraction form
    85,319.40/127,979.10 = 81,863.40/x
  3. Step 3: Cross multiply
    85,319.40x = 127,979.10 × 81,863.40
  4. Step 4: Simplify right side
    85,319.40x = 10,476,804,254.94
  5. Step 5: Solve for x
    x = 10,476,804,254.94/85,319.40
  6. Step 6: Final answer
    x = 122,795.10

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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.