Home / 13,719.49-18,938.15-8,421.51

Finding the Fourth Proportional to 13,719.49, 18,938.15 and 8,421.51

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Solution

The fourth proportional to 13,719.49, 18,938.15 and 8,421.51 is: 11,624.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,719.49 : 18,938.15 = 8,421.51 : x
  2. Step 2: Convert to fraction form
    13,719.49/18,938.15 = 8,421.51/x
  3. Step 3: Cross multiply
    13,719.49x = 18,938.15 × 8,421.51
  4. Step 4: Simplify right side
    13,719.49x = 159,487,819.61
  5. Step 5: Solve for x
    x = 159,487,819.61/13,719.49
  6. Step 6: Final answer
    x = 11,624.91

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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.