Home / 21,981.52-30,330.12-13,035.76

Finding the Fourth Proportional to 21,981.52, 30,330.12 and 13,035.76

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Solution

The fourth proportional to 21,981.52, 30,330.12 and 13,035.76 is: 17,986.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,981.52 : 30,330.12 = 13,035.76 : x
  2. Step 2: Convert to fraction form
    21,981.52/30,330.12 = 13,035.76/x
  3. Step 3: Cross multiply
    21,981.52x = 30,330.12 × 13,035.76
  4. Step 4: Simplify right side
    21,981.52x = 395,376,165.09
  5. Step 5: Solve for x
    x = 395,376,165.09/21,981.52
  6. Step 6: Final answer
    x = 17,986.75

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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.