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Finding the Fourth Proportional to 1,613.71, 2,420.91 and 920.71

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Solution

The fourth proportional to 1,613.71, 2,420.91 and 920.71 is: 1,381.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.71 : 2,420.91 = 920.71 : x
  2. Step 2: Convert to fraction form
    1,613.71/2,420.91 = 920.71/x
  3. Step 3: Cross multiply
    1,613.71x = 2,420.91 × 920.71
  4. Step 4: Simplify right side
    1,613.71x = 2,228,956.05
  5. Step 5: Solve for x
    x = 2,228,956.05/1,613.71
  6. Step 6: Final answer
    x = 1,381.26

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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.