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Finding the Fourth Proportional to 1,379.10, 2,066.88 and 647.06

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Solution

The fourth proportional to 1,379.10, 2,066.88 and 647.06 is: 969.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.10 : 2,066.88 = 647.06 : x
  2. Step 2: Convert to fraction form
    1,379.10/2,066.88 = 647.06/x
  3. Step 3: Cross multiply
    1,379.10x = 2,066.88 × 647.06
  4. Step 4: Simplify right side
    1,379.10x = 1,337,395.37
  5. Step 5: Solve for x
    x = 1,337,395.37/1,379.10
  6. Step 6: Final answer
    x = 969.76

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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.