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Finding the Fourth Proportional to 814.94, 1,215.78 and 698.02

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Solution

The fourth proportional to 814.94, 1,215.78 and 698.02 is: 1,041.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.94 : 1,215.78 = 698.02 : x
  2. Step 2: Convert to fraction form
    814.94/1,215.78 = 698.02/x
  3. Step 3: Cross multiply
    814.94x = 1,215.78 × 698.02
  4. Step 4: Simplify right side
    814.94x = 848,638.76
  5. Step 5: Solve for x
    x = 848,638.76/814.94
  6. Step 6: Final answer
    x = 1,041.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.