Home / 21,318.40-31,966.95-12,436.79

Finding the Fourth Proportional to 21,318.40, 31,966.95 and 12,436.79

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Solution

The fourth proportional to 21,318.40, 31,966.95 and 12,436.79 is: 18,648.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,318.40 : 31,966.95 = 12,436.79 : x
  2. Step 2: Convert to fraction form
    21,318.40/31,966.95 = 12,436.79/x
  3. Step 3: Cross multiply
    21,318.40x = 31,966.95 × 12,436.79
  4. Step 4: Simplify right side
    21,318.40x = 397,566,130.89
  5. Step 5: Solve for x
    x = 397,566,130.89/21,318.40
  6. Step 6: Final answer
    x = 18,648.97

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1.5x scale

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.