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Finding the Fourth Proportional to 122,218.15, 168,345.55 and 86,345.87

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Solution

The fourth proportional to 122,218.15, 168,345.55 and 86,345.87 is: 118,934.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,218.15 : 168,345.55 = 86,345.87 : x
  2. Step 2: Convert to fraction form
    122,218.15/168,345.55 = 86,345.87/x
  3. Step 3: Cross multiply
    122,218.15x = 168,345.55 × 86,345.87
  4. Step 4: Simplify right side
    122,218.15x = 14,535,942,975.38
  5. Step 5: Solve for x
    x = 14,535,942,975.38/122,218.15
  6. Step 6: Final answer
    x = 118,934.41

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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.