Home / 21,208.23-31,780.35-19,340.78

Finding the Fourth Proportional to 21,208.23, 31,780.35 and 19,340.78

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Solution

The fourth proportional to 21,208.23, 31,780.35 and 19,340.78 is: 28,981.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,208.23 : 31,780.35 = 19,340.78 : x
  2. Step 2: Convert to fraction form
    21,208.23/31,780.35 = 19,340.78/x
  3. Step 3: Cross multiply
    21,208.23x = 31,780.35 × 19,340.78
  4. Step 4: Simplify right side
    21,208.23x = 614,656,598.77
  5. Step 5: Solve for x
    x = 614,656,598.77/21,208.23
  6. Step 6: Final answer
    x = 28,981.98

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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.