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Finding the Fourth Proportional to 1,446.70, 2,170.40 and 420.70

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Solution

The fourth proportional to 1,446.70, 2,170.40 and 420.70 is: 631.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,446.70 : 2,170.40 = 420.70 : x
  2. Step 2: Convert to fraction form
    1,446.70/2,170.40 = 420.70/x
  3. Step 3: Cross multiply
    1,446.70x = 2,170.40 × 420.70
  4. Step 4: Simplify right side
    1,446.70x = 913,087.28
  5. Step 5: Solve for x
    x = 913,087.28/1,446.70
  6. Step 6: Final answer
    x = 631.15

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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.