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Finding the Fourth Proportional to 2,656.65, 3,985.14 and 807.90

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Solution

The fourth proportional to 2,656.65, 3,985.14 and 807.90 is: 1,211.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,656.65 : 3,985.14 = 807.90 : x
  2. Step 2: Convert to fraction form
    2,656.65/3,985.14 = 807.90/x
  3. Step 3: Cross multiply
    2,656.65x = 3,985.14 × 807.90
  4. Step 4: Simplify right side
    2,656.65x = 3,219,610.14
  5. Step 5: Solve for x
    x = 3,219,610.14/2,656.65
  6. Step 6: Final answer
    x = 1,211.90

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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.