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Finding the Fourth Proportional to 665.61, 992.55 and 619.44

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Solution

The fourth proportional to 665.61, 992.55 and 619.44 is: 923.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.61 : 992.55 = 619.44 : x
  2. Step 2: Convert to fraction form
    665.61/992.55 = 619.44/x
  3. Step 3: Cross multiply
    665.61x = 992.55 × 619.44
  4. Step 4: Simplify right side
    665.61x = 614,825.17
  5. Step 5: Solve for x
    x = 614,825.17/665.61
  6. Step 6: Final answer
    x = 923.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.