Home / 15,687.95-21,638.45-13,313.74

Finding the Fourth Proportional to 15,687.95, 21,638.45 and 13,313.74

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Solution

The fourth proportional to 15,687.95, 21,638.45 and 13,313.74 is: 18,363.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,687.95 : 21,638.45 = 13,313.74 : x
  2. Step 2: Convert to fraction form
    15,687.95/21,638.45 = 13,313.74/x
  3. Step 3: Cross multiply
    15,687.95x = 21,638.45 × 13,313.74
  4. Step 4: Simplify right side
    15,687.95x = 288,088,630.73
  5. Step 5: Solve for x
    x = 288,088,630.73/15,687.95
  6. Step 6: Final answer
    x = 18,363.69

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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.