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Finding the Fourth Proportional to 993.84, 1,490.80 and 717.36

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Solution

The fourth proportional to 993.84, 1,490.80 and 717.36 is: 1,076.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.84 : 1,490.80 = 717.36 : x
  2. Step 2: Convert to fraction form
    993.84/1,490.80 = 717.36/x
  3. Step 3: Cross multiply
    993.84x = 1,490.80 × 717.36
  4. Step 4: Simplify right side
    993.84x = 1,069,440.29
  5. Step 5: Solve for x
    x = 1,069,440.29/993.84
  6. Step 6: Final answer
    x = 1,076.07

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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.