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Finding the Fourth Proportional to 1,339.79, 2,011.42 and 1,031.86

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Solution

The fourth proportional to 1,339.79, 2,011.42 and 1,031.86 is: 1,549.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.79 : 2,011.42 = 1,031.86 : x
  2. Step 2: Convert to fraction form
    1,339.79/2,011.42 = 1,031.86/x
  3. Step 3: Cross multiply
    1,339.79x = 2,011.42 × 1,031.86
  4. Step 4: Simplify right side
    1,339.79x = 2,075,490.53
  5. Step 5: Solve for x
    x = 2,075,490.53/1,339.79
  6. Step 6: Final answer
    x = 1,549.12

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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.