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Finding the Fourth Proportional to 1,376.68, 2,065.40 and 499.28

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Solution

The fourth proportional to 1,376.68, 2,065.40 and 499.28 is: 749.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.68 : 2,065.40 = 499.28 : x
  2. Step 2: Convert to fraction form
    1,376.68/2,065.40 = 499.28/x
  3. Step 3: Cross multiply
    1,376.68x = 2,065.40 × 499.28
  4. Step 4: Simplify right side
    1,376.68x = 1,031,212.91
  5. Step 5: Solve for x
    x = 1,031,212.91/1,376.68
  6. Step 6: Final answer
    x = 749.06

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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.