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Finding the Fourth Proportional to 1,339.91, 2,011.08 and 931.67

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Solution

The fourth proportional to 1,339.91, 2,011.08 and 931.67 is: 1,398.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.91 : 2,011.08 = 931.67 : x
  2. Step 2: Convert to fraction form
    1,339.91/2,011.08 = 931.67/x
  3. Step 3: Cross multiply
    1,339.91x = 2,011.08 × 931.67
  4. Step 4: Simplify right side
    1,339.91x = 1,873,652.85
  5. Step 5: Solve for x
    x = 1,873,652.85/1,339.91
  6. Step 6: Final answer
    x = 1,398.35

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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.