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Finding the Fourth Proportional to 15,720.36, 21,690.36 and 9,979.44

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Solution

The fourth proportional to 15,720.36, 21,690.36 and 9,979.44 is: 13,769.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720.36 : 21,690.36 = 9,979.44 : x
  2. Step 2: Convert to fraction form
    15,720.36/21,690.36 = 9,979.44/x
  3. Step 3: Cross multiply
    15,720.36x = 21,690.36 × 9,979.44
  4. Step 4: Simplify right side
    15,720.36x = 216,457,646.20
  5. Step 5: Solve for x
    x = 216,457,646.20/15,720.36
  6. Step 6: Final answer
    x = 13,769.26

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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.