Home / 15,491.89-21,378.95-8,418.32

Finding the Fourth Proportional to 15,491.89, 21,378.95 and 8,418.32

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Solution

The fourth proportional to 15,491.89, 21,378.95 and 8,418.32 is: 11,617.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,491.89 : 21,378.95 = 8,418.32 : x
  2. Step 2: Convert to fraction form
    15,491.89/21,378.95 = 8,418.32/x
  3. Step 3: Cross multiply
    15,491.89x = 21,378.95 × 8,418.32
  4. Step 4: Simplify right side
    15,491.89x = 179,974,842.36
  5. Step 5: Solve for x
    x = 179,974,842.36/15,491.89
  6. Step 6: Final answer
    x = 11,617.36

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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.