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Finding the Fourth Proportional to 121,879.68, 168,196.68 and 86,132.76

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Solution

The fourth proportional to 121,879.68, 168,196.68 and 86,132.76 is: 118,865.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,879.68 : 168,196.68 = 86,132.76 : x
  2. Step 2: Convert to fraction form
    121,879.68/168,196.68 = 86,132.76/x
  3. Step 3: Cross multiply
    121,879.68x = 168,196.68 × 86,132.76
  4. Step 4: Simplify right side
    121,879.68x = 14,487,244,271.24
  5. Step 5: Solve for x
    x = 14,487,244,271.24/121,879.68
  6. Step 6: Final answer
    x = 118,865.13

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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.