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Finding the Fourth Proportional to 121,908.50, 168,267.55 and 70,931.08

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Solution

The fourth proportional to 121,908.50, 168,267.55 and 70,931.08 is: 97,904.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,908.50 : 168,267.55 = 70,931.08 : x
  2. Step 2: Convert to fraction form
    121,908.50/168,267.55 = 70,931.08/x
  3. Step 3: Cross multiply
    121,908.50x = 168,267.55 × 70,931.08
  4. Step 4: Simplify right side
    121,908.50x = 11,935,399,349.45
  5. Step 5: Solve for x
    x = 11,935,399,349.45/121,908.50
  6. Step 6: Final answer
    x = 97,904.57

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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.