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Finding the Fourth Proportional to 810.95, 1,216.40 and 656.06

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Solution

The fourth proportional to 810.95, 1,216.40 and 656.06 is: 984.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.95 : 1,216.40 = 656.06 : x
  2. Step 2: Convert to fraction form
    810.95/1,216.40 = 656.06/x
  3. Step 3: Cross multiply
    810.95x = 1,216.40 × 656.06
  4. Step 4: Simplify right side
    810.95x = 798,022.02
  5. Step 5: Solve for x
    x = 798,022.02/810.95
  6. Step 6: Final answer
    x = 984.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.