Home / 20,815.36-28,710.16-13,254.24

Finding the Fourth Proportional to 20,815.36, 28,710.16 and 13,254.24

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Solution

The fourth proportional to 20,815.36, 28,710.16 and 13,254.24 is: 18,281.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.36 : 28,710.16 = 13,254.24 : x
  2. Step 2: Convert to fraction form
    20,815.36/28,710.16 = 13,254.24/x
  3. Step 3: Cross multiply
    20,815.36x = 28,710.16 × 13,254.24
  4. Step 4: Simplify right side
    20,815.36x = 380,531,351.08
  5. Step 5: Solve for x
    x = 380,531,351.08/20,815.36
  6. Step 6: Final answer
    x = 18,281.28

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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.