Home / 21,390.50-31,929.08-18,865.46

Finding the Fourth Proportional to 21,390.50, 31,929.08 and 18,865.46

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Solution

The fourth proportional to 21,390.50, 31,929.08 and 18,865.46 is: 28,160.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.50 : 31,929.08 = 18,865.46 : x
  2. Step 2: Convert to fraction form
    21,390.50/31,929.08 = 18,865.46/x
  3. Step 3: Cross multiply
    21,390.50x = 31,929.08 × 18,865.46
  4. Step 4: Simplify right side
    21,390.50x = 602,356,781.58
  5. Step 5: Solve for x
    x = 602,356,781.58/21,390.50
  6. Step 6: Final answer
    x = 28,160.01

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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.