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Finding the Fourth Proportional to 717.77, 990.50 and 438.47

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Solution

The fourth proportional to 717.77, 990.50 and 438.47 is: 605.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.77 : 990.50 = 438.47 : x
  2. Step 2: Convert to fraction form
    717.77/990.50 = 438.47/x
  3. Step 3: Cross multiply
    717.77x = 990.50 × 438.47
  4. Step 4: Simplify right side
    717.77x = 434,303.89
  5. Step 5: Solve for x
    x = 434,303.89/717.77
  6. Step 6: Final answer
    x = 605.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.