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Finding the Fourth Proportional to 121,203.72, 167,203.71 and 78,746.76

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Solution

The fourth proportional to 121,203.72, 167,203.71 and 78,746.76 is: 108,633.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,203.72 : 167,203.71 = 78,746.76 : x
  2. Step 2: Convert to fraction form
    121,203.72/167,203.71 = 78,746.76/x
  3. Step 3: Cross multiply
    121,203.72x = 167,203.71 × 78,746.76
  4. Step 4: Simplify right side
    121,203.72x = 13,166,750,422.48
  5. Step 5: Solve for x
    x = 13,166,750,422.48/121,203.72
  6. Step 6: Final answer
    x = 108,633.22

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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.