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Finding the Fourth Proportional to 990.17, 1,487.31 and 786.16

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Solution

The fourth proportional to 990.17, 1,487.31 and 786.16 is: 1,180.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.17 : 1,487.31 = 786.16 : x
  2. Step 2: Convert to fraction form
    990.17/1,487.31 = 786.16/x
  3. Step 3: Cross multiply
    990.17x = 1,487.31 × 786.16
  4. Step 4: Simplify right side
    990.17x = 1,169,263.63
  5. Step 5: Solve for x
    x = 1,169,263.63/990.17
  6. Step 6: Final answer
    x = 1,180.87

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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.