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Finding the Fourth Proportional to 963.61, 1,328.45 and 609.35

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Solution

The fourth proportional to 963.61, 1,328.45 and 609.35 is: 840.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.61 : 1,328.45 = 609.35 : x
  2. Step 2: Convert to fraction form
    963.61/1,328.45 = 609.35/x
  3. Step 3: Cross multiply
    963.61x = 1,328.45 × 609.35
  4. Step 4: Simplify right side
    963.61x = 809,491.01
  5. Step 5: Solve for x
    x = 809,491.01/963.61
  6. Step 6: Final answer
    x = 840.07

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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.