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Finding the Fourth Proportional to 21,987.80, 32,981.70 and 18,715.40

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Solution

The fourth proportional to 21,987.80, 32,981.70 and 18,715.40 is: 28,073.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.80 : 32,981.70 = 18,715.40 : x
  2. Step 2: Convert to fraction form
    21,987.80/32,981.70 = 18,715.40/x
  3. Step 3: Cross multiply
    21,987.80x = 32,981.70 × 18,715.40
  4. Step 4: Simplify right side
    21,987.80x = 617,265,708.18
  5. Step 5: Solve for x
    x = 617,265,708.18/21,987.80
  6. Step 6: Final answer
    x = 28,073.10

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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.