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Finding the Fourth Proportional to 1,211.50, 1,817.62 and 378.53

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Solution

The fourth proportional to 1,211.50, 1,817.62 and 378.53 is: 567.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.50 : 1,817.62 = 378.53 : x
  2. Step 2: Convert to fraction form
    1,211.50/1,817.62 = 378.53/x
  3. Step 3: Cross multiply
    1,211.50x = 1,817.62 × 378.53
  4. Step 4: Simplify right side
    1,211.50x = 688,031.29
  5. Step 5: Solve for x
    x = 688,031.29/1,211.50
  6. Step 6: Final answer
    x = 567.91

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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.