Home / 21,316.95-31,957.19-8,178.75

Finding the Fourth Proportional to 21,316.95, 31,957.19 and 8,178.75

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Solution

The fourth proportional to 21,316.95, 31,957.19 and 8,178.75 is: 12,261.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,316.95 : 31,957.19 = 8,178.75 : x
  2. Step 2: Convert to fraction form
    21,316.95/31,957.19 = 8,178.75/x
  3. Step 3: Cross multiply
    21,316.95x = 31,957.19 × 8,178.75
  4. Step 4: Simplify right side
    21,316.95x = 261,369,888.16
  5. Step 5: Solve for x
    x = 261,369,888.16/21,316.95
  6. Step 6: Final answer
    x = 12,261.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.