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Finding the Fourth Proportional to 984.18, 1,357.82 and 630.16

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Solution

The fourth proportional to 984.18, 1,357.82 and 630.16 is: 869.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.18 : 1,357.82 = 630.16 : x
  2. Step 2: Convert to fraction form
    984.18/1,357.82 = 630.16/x
  3. Step 3: Cross multiply
    984.18x = 1,357.82 × 630.16
  4. Step 4: Simplify right side
    984.18x = 855,639.67
  5. Step 5: Solve for x
    x = 855,639.67/984.18
  6. Step 6: Final answer
    x = 869.40

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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.