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Finding the Fourth Proportional to 163,853.70, 245,788.65 and 85,121.70

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Solution

The fourth proportional to 163,853.70, 245,788.65 and 85,121.70 is: 127,686.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    163,853.70 : 245,788.65 = 85,121.70 : x
  2. Step 2: Convert to fraction form
    163,853.70/245,788.65 = 85,121.70/x
  3. Step 3: Cross multiply
    163,853.70x = 245,788.65 × 85,121.70
  4. Step 4: Simplify right side
    163,853.70x = 20,921,947,728.71
  5. Step 5: Solve for x
    x = 20,921,947,728.71/163,853.70
  6. Step 6: Final answer
    x = 127,686.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.