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Finding the Fourth Proportional to 121,987.35, 168,310.47 and 70,291.74

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Solution

The fourth proportional to 121,987.35, 168,310.47 and 70,291.74 is: 96,984.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,987.35 : 168,310.47 = 70,291.74 : x
  2. Step 2: Convert to fraction form
    121,987.35/168,310.47 = 70,291.74/x
  3. Step 3: Cross multiply
    121,987.35x = 168,310.47 × 70,291.74
  4. Step 4: Simplify right side
    121,987.35x = 11,830,835,796.52
  5. Step 5: Solve for x
    x = 11,830,835,796.52/121,987.35
  6. Step 6: Final answer
    x = 96,984.12

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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.