Home / 15,491.11-21,357.13-12,315.10

Finding the Fourth Proportional to 15,491.11, 21,357.13 and 12,315.10

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Solution

The fourth proportional to 15,491.11, 21,357.13 and 12,315.10 is: 16,978.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,491.11 : 21,357.13 = 12,315.10 : x
  2. Step 2: Convert to fraction form
    15,491.11/21,357.13 = 12,315.10/x
  3. Step 3: Cross multiply
    15,491.11x = 21,357.13 × 12,315.10
  4. Step 4: Simplify right side
    15,491.11x = 263,015,191.66
  5. Step 5: Solve for x
    x = 263,015,191.66/15,491.11
  6. Step 6: Final answer
    x = 16,978.46

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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.