Home / 21,985.68-30,345.75-12,559.71

Finding the Fourth Proportional to 21,985.68, 30,345.75 and 12,559.71

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Solution

The fourth proportional to 21,985.68, 30,345.75 and 12,559.71 is: 17,335.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,985.68 : 30,345.75 = 12,559.71 : x
  2. Step 2: Convert to fraction form
    21,985.68/30,345.75 = 12,559.71/x
  3. Step 3: Cross multiply
    21,985.68x = 30,345.75 × 12,559.71
  4. Step 4: Simplify right side
    21,985.68x = 381,133,819.73
  5. Step 5: Solve for x
    x = 381,133,819.73/21,985.68
  6. Step 6: Final answer
    x = 17,335.55

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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.