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Finding the Fourth Proportional to 918.74, 1,265.88 and 623.50

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Solution

The fourth proportional to 918.74, 1,265.88 and 623.50 is: 859.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.74 : 1,265.88 = 623.50 : x
  2. Step 2: Convert to fraction form
    918.74/1,265.88 = 623.50/x
  3. Step 3: Cross multiply
    918.74x = 1,265.88 × 623.50
  4. Step 4: Simplify right side
    918.74x = 789,276.18
  5. Step 5: Solve for x
    x = 789,276.18/918.74
  6. Step 6: Final answer
    x = 859.09

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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.