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Finding the Fourth Proportional to 112,934.80, 169,402.20 and 86,690.80

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Solution

The fourth proportional to 112,934.80, 169,402.20 and 86,690.80 is: 130,036.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,934.80 : 169,402.20 = 86,690.80 : x
  2. Step 2: Convert to fraction form
    112,934.80/169,402.20 = 86,690.80/x
  3. Step 3: Cross multiply
    112,934.80x = 169,402.20 × 86,690.80
  4. Step 4: Simplify right side
    112,934.80x = 14,685,612,239.76
  5. Step 5: Solve for x
    x = 14,685,612,239.76/112,934.80
  6. Step 6: Final answer
    x = 130,036.20

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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.