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Finding the Fourth Proportional to 1,308.91, 1,806.36 and 749.50

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Solution

The fourth proportional to 1,308.91, 1,806.36 and 749.50 is: 1,034.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.91 : 1,806.36 = 749.50 : x
  2. Step 2: Convert to fraction form
    1,308.91/1,806.36 = 749.50/x
  3. Step 3: Cross multiply
    1,308.91x = 1,806.36 × 749.50
  4. Step 4: Simplify right side
    1,308.91x = 1,353,866.82
  5. Step 5: Solve for x
    x = 1,353,866.82/1,308.91
  6. Step 6: Final answer
    x = 1,034.35

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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.