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Finding the Fourth Proportional to 984.24, 1,358.40 and 747.80

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Solution

The fourth proportional to 984.24, 1,358.40 and 747.80 is: 1,032.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.24 : 1,358.40 = 747.80 : x
  2. Step 2: Convert to fraction form
    984.24/1,358.40 = 747.80/x
  3. Step 3: Cross multiply
    984.24x = 1,358.40 × 747.80
  4. Step 4: Simplify right side
    984.24x = 1,015,807.02
  5. Step 5: Solve for x
    x = 1,015,807.02/984.24
  6. Step 6: Final answer
    x = 1,032.08

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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.