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Finding the Fourth Proportional to 816.49, 1,225.20 and 383.68

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Solution

The fourth proportional to 816.49, 1,225.20 and 383.68 is: 575.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.49 : 1,225.20 = 383.68 : x
  2. Step 2: Convert to fraction form
    816.49/1,225.20 = 383.68/x
  3. Step 3: Cross multiply
    816.49x = 1,225.20 × 383.68
  4. Step 4: Simplify right side
    816.49x = 470,084.74
  5. Step 5: Solve for x
    x = 470,084.74/816.49
  6. Step 6: Final answer
    x = 575.74

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Double scale
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1.5x scale

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.