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Finding the Fourth Proportional to 21,411.20, 32,116.80 and 13,116.80

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Solution

The fourth proportional to 21,411.20, 32,116.80 and 13,116.80 is: 19,675.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,411.20 : 32,116.80 = 13,116.80 : x
  2. Step 2: Convert to fraction form
    21,411.20/32,116.80 = 13,116.80/x
  3. Step 3: Cross multiply
    21,411.20x = 32,116.80 × 13,116.80
  4. Step 4: Simplify right side
    21,411.20x = 421,269,642.24
  5. Step 5: Solve for x
    x = 421,269,642.24/21,411.20
  6. Step 6: Final answer
    x = 19,675.20

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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.