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Finding the Fourth Proportional to 21,916.80, 32,810.40 and 13,168.80

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Solution

The fourth proportional to 21,916.80, 32,810.40 and 13,168.80 is: 19,714.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,916.80 : 32,810.40 = 13,168.80 : x
  2. Step 2: Convert to fraction form
    21,916.80/32,810.40 = 13,168.80/x
  3. Step 3: Cross multiply
    21,916.80x = 32,810.40 × 13,168.80
  4. Step 4: Simplify right side
    21,916.80x = 432,073,595.52
  5. Step 5: Solve for x
    x = 432,073,595.52/21,916.80
  6. Step 6: Final answer
    x = 19,714.26

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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.