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Finding the Fourth Proportional to 814.20, 1,215.03 and 670.20

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Solution

The fourth proportional to 814.20, 1,215.03 and 670.20 is: 1,000.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.20 : 1,215.03 = 670.20 : x
  2. Step 2: Convert to fraction form
    814.20/1,215.03 = 670.20/x
  3. Step 3: Cross multiply
    814.20x = 1,215.03 × 670.20
  4. Step 4: Simplify right side
    814.20x = 814,313.11
  5. Step 5: Solve for x
    x = 814,313.11/814.20
  6. Step 6: Final answer
    x = 1,000.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.