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Finding the Fourth Proportional to 21,875.58, 32,820.57 and 8,720.70

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Solution

The fourth proportional to 21,875.58, 32,820.57 and 8,720.70 is: 13,083.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,875.58 : 32,820.57 = 8,720.70 : x
  2. Step 2: Convert to fraction form
    21,875.58/32,820.57 = 8,720.70/x
  3. Step 3: Cross multiply
    21,875.58x = 32,820.57 × 8,720.70
  4. Step 4: Simplify right side
    21,875.58x = 286,218,344.80
  5. Step 5: Solve for x
    x = 286,218,344.80/21,875.58
  6. Step 6: Final answer
    x = 13,083.92

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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.