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Finding the Fourth Proportional to 984.72, 1,483.92 and 815.16

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Solution

The fourth proportional to 984.72, 1,483.92 and 815.16 is: 1,228.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.72 : 1,483.92 = 815.16 : x
  2. Step 2: Convert to fraction form
    984.72/1,483.92 = 815.16/x
  3. Step 3: Cross multiply
    984.72x = 1,483.92 × 815.16
  4. Step 4: Simplify right side
    984.72x = 1,209,632.23
  5. Step 5: Solve for x
    x = 1,209,632.23/984.72
  6. Step 6: Final answer
    x = 1,228.40

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.