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Finding the Fourth Proportional to 1,266.70, 1,748 and 707.14

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Solution

The fourth proportional to 1,266.70, 1,748 and 707.14 is: 975.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.70 : 1,748 = 707.14 : x
  2. Step 2: Convert to fraction form
    1,266.70/1,748 = 707.14/x
  3. Step 3: Cross multiply
    1,266.70x = 1,748 × 707.14
  4. Step 4: Simplify right side
    1,266.70x = 1,236,080.72
  5. Step 5: Solve for x
    x = 1,236,080.72/1,266.70
  6. Step 6: Final answer
    x = 975.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.