Home / 10,656.47-15,985.68-5,388.20

Finding the Fourth Proportional to 10,656.47, 15,985.68 and 5,388.20

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Solution

The fourth proportional to 10,656.47, 15,985.68 and 5,388.20 is: 8,082.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,656.47 : 15,985.68 = 5,388.20 : x
  2. Step 2: Convert to fraction form
    10,656.47/15,985.68 = 5,388.20/x
  3. Step 3: Cross multiply
    10,656.47x = 15,985.68 × 5,388.20
  4. Step 4: Simplify right side
    10,656.47x = 86,133,970.98
  5. Step 5: Solve for x
    x = 86,133,970.98/10,656.47
  6. Step 6: Final answer
    x = 8,082.78

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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.