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Finding the Fourth Proportional to 21,608.87, 29,779.53 and 15,630.40

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Solution

The fourth proportional to 21,608.87, 29,779.53 and 15,630.40 is: 21,540.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,608.87 : 29,779.53 = 15,630.40 : x
  2. Step 2: Convert to fraction form
    21,608.87/29,779.53 = 15,630.40/x
  3. Step 3: Cross multiply
    21,608.87x = 29,779.53 × 15,630.40
  4. Step 4: Simplify right side
    21,608.87x = 465,465,816.81
  5. Step 5: Solve for x
    x = 465,465,816.81/21,608.87
  6. Step 6: Final answer
    x = 21,540.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.