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Finding the Fourth Proportional to 1,040.07, 1,557.38 and 628.65

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Solution

The fourth proportional to 1,040.07, 1,557.38 and 628.65 is: 941.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.07 : 1,557.38 = 628.65 : x
  2. Step 2: Convert to fraction form
    1,040.07/1,557.38 = 628.65/x
  3. Step 3: Cross multiply
    1,040.07x = 1,557.38 × 628.65
  4. Step 4: Simplify right side
    1,040.07x = 979,043.79
  5. Step 5: Solve for x
    x = 979,043.79/1,040.07
  6. Step 6: Final answer
    x = 941.32

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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.