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Finding the Fourth Proportional to 1,038.69, 1,555.07 and 691.20

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Solution

The fourth proportional to 1,038.69, 1,555.07 and 691.20 is: 1,034.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.69 : 1,555.07 = 691.20 : x
  2. Step 2: Convert to fraction form
    1,038.69/1,555.07 = 691.20/x
  3. Step 3: Cross multiply
    1,038.69x = 1,555.07 × 691.20
  4. Step 4: Simplify right side
    1,038.69x = 1,074,860.93
  5. Step 5: Solve for x
    x = 1,074,860.93/1,038.69
  6. Step 6: Final answer
    x = 1,034.82

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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.