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Finding the Fourth Proportional to 1,377.56, 2,066.34 and 647

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Solution

The fourth proportional to 1,377.56, 2,066.34 and 647 is: 970.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.56 : 2,066.34 = 647 : x
  2. Step 2: Convert to fraction form
    1,377.56/2,066.34 = 647/x
  3. Step 3: Cross multiply
    1,377.56x = 2,066.34 × 647
  4. Step 4: Simplify right side
    1,377.56x = 1,336,921.98
  5. Step 5: Solve for x
    x = 1,336,921.98/1,377.56
  6. Step 6: Final answer
    x = 970.50

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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.