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Finding the Fourth Proportional to 931.18, 1,388.64 and 816.16

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Solution

The fourth proportional to 931.18, 1,388.64 and 816.16 is: 1,217.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.18 : 1,388.64 = 816.16 : x
  2. Step 2: Convert to fraction form
    931.18/1,388.64 = 816.16/x
  3. Step 3: Cross multiply
    931.18x = 1,388.64 × 816.16
  4. Step 4: Simplify right side
    931.18x = 1,133,352.42
  5. Step 5: Solve for x
    x = 1,133,352.42/931.18
  6. Step 6: Final answer
    x = 1,217.11

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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.