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Finding the Fourth Proportional to 918.55, 1,374.94 and 686.11

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Solution

The fourth proportional to 918.55, 1,374.94 and 686.11 is: 1,027.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.55 : 1,374.94 = 686.11 : x
  2. Step 2: Convert to fraction form
    918.55/1,374.94 = 686.11/x
  3. Step 3: Cross multiply
    918.55x = 1,374.94 × 686.11
  4. Step 4: Simplify right side
    918.55x = 943,360.08
  5. Step 5: Solve for x
    x = 943,360.08/918.55
  6. Step 6: Final answer
    x = 1,027.01

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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.