Home / 19,178.78-28,772.10-7,331.72

Finding the Fourth Proportional to 19,178.78, 28,772.10 and 7,331.72

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Solution

The fourth proportional to 19,178.78, 28,772.10 and 7,331.72 is: 10,999.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,178.78 : 28,772.10 = 7,331.72 : x
  2. Step 2: Convert to fraction form
    19,178.78/28,772.10 = 7,331.72/x
  3. Step 3: Cross multiply
    19,178.78x = 28,772.10 × 7,331.72
  4. Step 4: Simplify right side
    19,178.78x = 210,948,981.01
  5. Step 5: Solve for x
    x = 210,948,981.01/19,178.78
  6. Step 6: Final answer
    x = 10,999.08

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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.