Home / 15,689.94-21,641.20-13,315.74

Finding the Fourth Proportional to 15,689.94, 21,641.20 and 13,315.74

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Solution

The fourth proportional to 15,689.94, 21,641.20 and 13,315.74 is: 18,366.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,689.94 : 21,641.20 = 13,315.74 : x
  2. Step 2: Convert to fraction form
    15,689.94/21,641.20 = 13,315.74/x
  3. Step 3: Cross multiply
    15,689.94x = 21,641.20 × 13,315.74
  4. Step 4: Simplify right side
    15,689.94x = 288,168,592.49
  5. Step 5: Solve for x
    x = 288,168,592.49/15,689.94
  6. Step 6: Final answer
    x = 18,366.46

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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.