Home / 15,416.80-21,272.16-9,131.20

Finding the Fourth Proportional to 15,416.80, 21,272.16 and 9,131.20

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Solution

The fourth proportional to 15,416.80, 21,272.16 and 9,131.20 is: 12,599.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,416.80 : 21,272.16 = 9,131.20 : x
  2. Step 2: Convert to fraction form
    15,416.80/21,272.16 = 9,131.20/x
  3. Step 3: Cross multiply
    15,416.80x = 21,272.16 × 9,131.20
  4. Step 4: Simplify right side
    15,416.80x = 194,240,347.39
  5. Step 5: Solve for x
    x = 194,240,347.39/15,416.80
  6. Step 6: Final answer
    x = 12,599.26

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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.