Home / 78,920.11-118,358.00-21,981.07

Finding the Fourth Proportional to 78,920.11, 118,358.00 and 21,981.07

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Solution

The fourth proportional to 78,920.11, 118,358.00 and 21,981.07 is: 32,965.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,920.11 : 118,358.00 = 21,981.07 : x
  2. Step 2: Convert to fraction form
    78,920.11/118,358.00 = 21,981.07/x
  3. Step 3: Cross multiply
    78,920.11x = 118,358.00 × 21,981.07
  4. Step 4: Simplify right side
    78,920.11x = 2,601,634,781.36
  5. Step 5: Solve for x
    x = 2,601,634,781.36/78,920.11
  6. Step 6: Final answer
    x = 32,965.42

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1.5x scale

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.