Home / 109,721.60-164,582.40-78,489.60

Finding the Fourth Proportional to 109,721.60, 164,582.40 and 78,489.60

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Solution

The fourth proportional to 109,721.60, 164,582.40 and 78,489.60 is: 117,734.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,721.60 : 164,582.40 = 78,489.60 : x
  2. Step 2: Convert to fraction form
    109,721.60/164,582.40 = 78,489.60/x
  3. Step 3: Cross multiply
    109,721.60x = 164,582.40 × 78,489.60
  4. Step 4: Simplify right side
    109,721.60x = 12,918,006,743.04
  5. Step 5: Solve for x
    x = 12,918,006,743.04/109,721.60
  6. Step 6: Final answer
    x = 117,734.40

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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.