Home / 15,389.91-21,233.35-9,415.35

Finding the Fourth Proportional to 15,389.91, 21,233.35 and 9,415.35

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Solution

The fourth proportional to 15,389.91, 21,233.35 and 9,415.35 is: 12,990.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,389.91 : 21,233.35 = 9,415.35 : x
  2. Step 2: Convert to fraction form
    15,389.91/21,233.35 = 9,415.35/x
  3. Step 3: Cross multiply
    15,389.91x = 21,233.35 × 9,415.35
  4. Step 4: Simplify right side
    15,389.91x = 199,919,421.92
  5. Step 5: Solve for x
    x = 199,919,421.92/15,389.91
  6. Step 6: Final answer
    x = 12,990.29

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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.