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Finding the Fourth Proportional to 818.84, 1,228.26 and 385.68

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Solution

The fourth proportional to 818.84, 1,228.26 and 385.68 is: 578.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.84 : 1,228.26 = 385.68 : x
  2. Step 2: Convert to fraction form
    818.84/1,228.26 = 385.68/x
  3. Step 3: Cross multiply
    818.84x = 1,228.26 × 385.68
  4. Step 4: Simplify right side
    818.84x = 473,715.32
  5. Step 5: Solve for x
    x = 473,715.32/818.84
  6. Step 6: Final answer
    x = 578.52

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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.