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Finding the Fourth Proportional to 810.50, 1,118.31 and 478.94

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Solution

The fourth proportional to 810.50, 1,118.31 and 478.94 is: 660.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.50 : 1,118.31 = 478.94 : x
  2. Step 2: Convert to fraction form
    810.50/1,118.31 = 478.94/x
  3. Step 3: Cross multiply
    810.50x = 1,118.31 × 478.94
  4. Step 4: Simplify right side
    810.50x = 535,603.39
  5. Step 5: Solve for x
    x = 535,603.39/810.50
  6. Step 6: Final answer
    x = 660.83

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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.