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Finding the Fourth Proportional to 78,920.61, 118,358.74 and 21,981.57

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Solution

The fourth proportional to 78,920.61, 118,358.74 and 21,981.57 is: 32,966.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,920.61 : 118,358.74 = 21,981.57 : x
  2. Step 2: Convert to fraction form
    78,920.61/118,358.74 = 21,981.57/x
  3. Step 3: Cross multiply
    78,920.61x = 118,358.74 × 21,981.57
  4. Step 4: Simplify right side
    78,920.61x = 2,601,710,928.42
  5. Step 5: Solve for x
    x = 2,601,710,928.42/78,920.61
  6. Step 6: Final answer
    x = 32,966.18

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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.