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Finding the Fourth Proportional to 856.30, 1,284.45 and 626.80

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Solution

The fourth proportional to 856.30, 1,284.45 and 626.80 is: 940.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.30 : 1,284.45 = 626.80 : x
  2. Step 2: Convert to fraction form
    856.30/1,284.45 = 626.80/x
  3. Step 3: Cross multiply
    856.30x = 1,284.45 × 626.80
  4. Step 4: Simplify right side
    856.30x = 805,093.26
  5. Step 5: Solve for x
    x = 805,093.26/856.30
  6. Step 6: Final answer
    x = 940.20

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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.