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Finding the Fourth Proportional to 717.84, 990.64 and 423.12

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Solution

The fourth proportional to 717.84, 990.64 and 423.12 is: 583.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.84 : 990.64 = 423.12 : x
  2. Step 2: Convert to fraction form
    717.84/990.64 = 423.12/x
  3. Step 3: Cross multiply
    717.84x = 990.64 × 423.12
  4. Step 4: Simplify right side
    717.84x = 419,159.60
  5. Step 5: Solve for x
    x = 419,159.60/717.84
  6. Step 6: Final answer
    x = 583.92

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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.