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Finding the Fourth Proportional to 772.48, 1,158.74 and 619.38

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Solution

The fourth proportional to 772.48, 1,158.74 and 619.38 is: 929.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.48 : 1,158.74 = 619.38 : x
  2. Step 2: Convert to fraction form
    772.48/1,158.74 = 619.38/x
  3. Step 3: Cross multiply
    772.48x = 1,158.74 × 619.38
  4. Step 4: Simplify right side
    772.48x = 717,700.38
  5. Step 5: Solve for x
    x = 717,700.38/772.48
  6. Step 6: Final answer
    x = 929.09

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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.