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Finding the Fourth Proportional to 2,291.70, 3,437.17 and 647.87

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Solution

The fourth proportional to 2,291.70, 3,437.17 and 647.87 is: 971.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,291.70 : 3,437.17 = 647.87 : x
  2. Step 2: Convert to fraction form
    2,291.70/3,437.17 = 647.87/x
  3. Step 3: Cross multiply
    2,291.70x = 3,437.17 × 647.87
  4. Step 4: Simplify right side
    2,291.70x = 2,226,839.33
  5. Step 5: Solve for x
    x = 2,226,839.33/2,291.70
  6. Step 6: Final answer
    x = 971.70

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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.