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Finding the Fourth Proportional to 813.02, 1,121.39 and 564.40

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Solution

The fourth proportional to 813.02, 1,121.39 and 564.40 is: 778.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.02 : 1,121.39 = 564.40 : x
  2. Step 2: Convert to fraction form
    813.02/1,121.39 = 564.40/x
  3. Step 3: Cross multiply
    813.02x = 1,121.39 × 564.40
  4. Step 4: Simplify right side
    813.02x = 632,916.39
  5. Step 5: Solve for x
    x = 632,916.39/813.02
  6. Step 6: Final answer
    x = 778.48

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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.