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Finding the Fourth Proportional to 121,908.88, 168,268.07 and 70,931.46

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Solution

The fourth proportional to 121,908.88, 168,268.07 and 70,931.46 is: 97,905.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,908.88 : 168,268.07 = 70,931.46 : x
  2. Step 2: Convert to fraction form
    121,908.88/168,268.07 = 70,931.46/x
  3. Step 3: Cross multiply
    121,908.88x = 168,268.07 × 70,931.46
  4. Step 4: Simplify right side
    121,908.88x = 11,935,499,156.81
  5. Step 5: Solve for x
    x = 11,935,499,156.81/121,908.88
  6. Step 6: Final answer
    x = 97,905.09

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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.