Home / 15,456.16-21,321.65-9,781.34

Finding the Fourth Proportional to 15,456.16, 21,321.65 and 9,781.34

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Solution

The fourth proportional to 15,456.16, 21,321.65 and 9,781.34 is: 13,493.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,456.16 : 21,321.65 = 9,781.34 : x
  2. Step 2: Convert to fraction form
    15,456.16/21,321.65 = 9,781.34/x
  3. Step 3: Cross multiply
    15,456.16x = 21,321.65 × 9,781.34
  4. Step 4: Simplify right side
    15,456.16x = 208,554,259.10
  5. Step 5: Solve for x
    x = 208,554,259.10/15,456.16
  6. Step 6: Final answer
    x = 13,493.28

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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.