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Finding the Fourth Proportional to 1,305.06, 1,956.70 and 688.11

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Solution

The fourth proportional to 1,305.06, 1,956.70 and 688.11 is: 1,031.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.06 : 1,956.70 = 688.11 : x
  2. Step 2: Convert to fraction form
    1,305.06/1,956.70 = 688.11/x
  3. Step 3: Cross multiply
    1,305.06x = 1,956.70 × 688.11
  4. Step 4: Simplify right side
    1,305.06x = 1,346,424.84
  5. Step 5: Solve for x
    x = 1,346,424.84/1,305.06
  6. Step 6: Final answer
    x = 1,031.70

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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.