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Finding the Fourth Proportional to 21,608.10, 32,412.15 and 21,280.05

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Solution

The fourth proportional to 21,608.10, 32,412.15 and 21,280.05 is: 31,920.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,608.10 : 32,412.15 = 21,280.05 : x
  2. Step 2: Convert to fraction form
    21,608.10/32,412.15 = 21,280.05/x
  3. Step 3: Cross multiply
    21,608.10x = 32,412.15 × 21,280.05
  4. Step 4: Simplify right side
    21,608.10x = 689,732,172.61
  5. Step 5: Solve for x
    x = 689,732,172.61/21,608.10
  6. Step 6: Final answer
    x = 31,920.08

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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.