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Finding the Fourth Proportional to 2,656.98, 3,985.20 and 709.38

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Solution

The fourth proportional to 2,656.98, 3,985.20 and 709.38 is: 1,064.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,656.98 : 3,985.20 = 709.38 : x
  2. Step 2: Convert to fraction form
    2,656.98/3,985.20 = 709.38/x
  3. Step 3: Cross multiply
    2,656.98x = 3,985.20 × 709.38
  4. Step 4: Simplify right side
    2,656.98x = 2,827,021.18
  5. Step 5: Solve for x
    x = 2,827,021.18/2,656.98
  6. Step 6: Final answer
    x = 1,064.00

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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.