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Finding the Fourth Proportional to 20,706.80, 28,555.60 and 13,916.16

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Solution

The fourth proportional to 20,706.80, 28,555.60 and 13,916.16 is: 19,191.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,706.80 : 28,555.60 = 13,916.16 : x
  2. Step 2: Convert to fraction form
    20,706.80/28,555.60 = 13,916.16/x
  3. Step 3: Cross multiply
    20,706.80x = 28,555.60 × 13,916.16
  4. Step 4: Simplify right side
    20,706.80x = 397,384,298.50
  5. Step 5: Solve for x
    x = 397,384,298.50/20,706.80
  6. Step 6: Final answer
    x = 19,191.00

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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.