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Finding the Fourth Proportional to 1,275.67, 1,913.55 and 351.23

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Solution

The fourth proportional to 1,275.67, 1,913.55 and 351.23 is: 526.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.67 : 1,913.55 = 351.23 : x
  2. Step 2: Convert to fraction form
    1,275.67/1,913.55 = 351.23/x
  3. Step 3: Cross multiply
    1,275.67x = 1,913.55 × 351.23
  4. Step 4: Simplify right side
    1,275.67x = 672,095.69
  5. Step 5: Solve for x
    x = 672,095.69/1,275.67
  6. Step 6: Final answer
    x = 526.86

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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.