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Finding the Fourth Proportional to 789.10, 1,089.18 and 553.11

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Solution

The fourth proportional to 789.10, 1,089.18 and 553.11 is: 763.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.10 : 1,089.18 = 553.11 : x
  2. Step 2: Convert to fraction form
    789.10/1,089.18 = 553.11/x
  3. Step 3: Cross multiply
    789.10x = 1,089.18 × 553.11
  4. Step 4: Simplify right side
    789.10x = 602,442.51
  5. Step 5: Solve for x
    x = 602,442.51/789.10
  6. Step 6: Final answer
    x = 763.45

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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.