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Finding the Fourth Proportional to 1,213.40, 1,820.10 and 1,123.40

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Solution

The fourth proportional to 1,213.40, 1,820.10 and 1,123.40 is: 1,685.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.40 : 1,820.10 = 1,123.40 : x
  2. Step 2: Convert to fraction form
    1,213.40/1,820.10 = 1,123.40/x
  3. Step 3: Cross multiply
    1,213.40x = 1,820.10 × 1,123.40
  4. Step 4: Simplify right side
    1,213.40x = 2,044,700.34
  5. Step 5: Solve for x
    x = 2,044,700.34/1,213.40
  6. Step 6: Final answer
    x = 1,685.10

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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.