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Finding the Fourth Proportional to 885.65, 1,328.46 and 423.62

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Solution

The fourth proportional to 885.65, 1,328.46 and 423.62 is: 635.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.65 : 1,328.46 = 423.62 : x
  2. Step 2: Convert to fraction form
    885.65/1,328.46 = 423.62/x
  3. Step 3: Cross multiply
    885.65x = 1,328.46 × 423.62
  4. Step 4: Simplify right side
    885.65x = 562,762.23
  5. Step 5: Solve for x
    x = 562,762.23/885.65
  6. Step 6: Final answer
    x = 635.42

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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.