Home / 21,389.88-31,928.14-18,864.83

Finding the Fourth Proportional to 21,389.88, 31,928.14 and 18,864.83

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Solution

The fourth proportional to 21,389.88, 31,928.14 and 18,864.83 is: 28,159.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,389.88 : 31,928.14 = 18,864.83 : x
  2. Step 2: Convert to fraction form
    21,389.88/31,928.14 = 18,864.83/x
  3. Step 3: Cross multiply
    21,389.88x = 31,928.14 × 18,864.83
  4. Step 4: Simplify right side
    21,389.88x = 602,318,820.84
  5. Step 5: Solve for x
    x = 602,318,820.84/21,389.88
  6. Step 6: Final answer
    x = 28,159.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.