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Finding the Fourth Proportional to 121,690.76, 168,048.27 and 115,064.15

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Solution

The fourth proportional to 121,690.76, 168,048.27 and 115,064.15 is: 158,897.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,690.76 : 168,048.27 = 115,064.15 : x
  2. Step 2: Convert to fraction form
    121,690.76/168,048.27 = 115,064.15/x
  3. Step 3: Cross multiply
    121,690.76x = 168,048.27 × 115,064.15
  4. Step 4: Simplify right side
    121,690.76x = 19,336,330,506.28
  5. Step 5: Solve for x
    x = 19,336,330,506.28/121,690.76
  6. Step 6: Final answer
    x = 158,897.28

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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.