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Finding the Fourth Proportional to 153,881.97, 212,367.86 and 85,912.30

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Solution

The fourth proportional to 153,881.97, 212,367.86 and 85,912.30 is: 118,564.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,881.97 : 212,367.86 = 85,912.30 : x
  2. Step 2: Convert to fraction form
    153,881.97/212,367.86 = 85,912.30/x
  3. Step 3: Cross multiply
    153,881.97x = 212,367.86 × 85,912.30
  4. Step 4: Simplify right side
    153,881.97x = 18,245,011,298.68
  5. Step 5: Solve for x
    x = 18,245,011,298.68/153,881.97
  6. Step 6: Final answer
    x = 118,564.97

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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.