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Finding the Fourth Proportional to 86,139.90, 118,863.54 and 51,682.80

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Solution

The fourth proportional to 86,139.90, 118,863.54 and 51,682.80 is: 71,316.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,139.90 : 118,863.54 = 51,682.80 : x
  2. Step 2: Convert to fraction form
    86,139.90/118,863.54 = 51,682.80/x
  3. Step 3: Cross multiply
    86,139.90x = 118,863.54 × 51,682.80
  4. Step 4: Simplify right side
    86,139.90x = 6,143,200,565.11
  5. Step 5: Solve for x
    x = 6,143,200,565.11/86,139.90
  6. Step 6: Final answer
    x = 71,316.55

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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.