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Finding the Fourth Proportional to 21,720.55, 32,581.43 and 7,678.59

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Solution

The fourth proportional to 21,720.55, 32,581.43 and 7,678.59 is: 11,518.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.55 : 32,581.43 = 7,678.59 : x
  2. Step 2: Convert to fraction form
    21,720.55/32,581.43 = 7,678.59/x
  3. Step 3: Cross multiply
    21,720.55x = 32,581.43 × 7,678.59
  4. Step 4: Simplify right side
    21,720.55x = 250,179,442.58
  5. Step 5: Solve for x
    x = 250,179,442.58/21,720.55
  6. Step 6: Final answer
    x = 11,518.10

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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.