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Finding the Fourth Proportional to 822.95, 1,135.28 and 557.30

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Solution

The fourth proportional to 822.95, 1,135.28 and 557.30 is: 768.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.95 : 1,135.28 = 557.30 : x
  2. Step 2: Convert to fraction form
    822.95/1,135.28 = 557.30/x
  3. Step 3: Cross multiply
    822.95x = 1,135.28 × 557.30
  4. Step 4: Simplify right side
    822.95x = 632,683.08
  5. Step 5: Solve for x
    x = 632,683.08/822.95
  6. Step 6: Final answer
    x = 768.80

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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.