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Finding the Fourth Proportional to 1,613.72, 2,421.78 and 626.69

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Solution

The fourth proportional to 1,613.72, 2,421.78 and 626.69 is: 940.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.72 : 2,421.78 = 626.69 : x
  2. Step 2: Convert to fraction form
    1,613.72/2,421.78 = 626.69/x
  3. Step 3: Cross multiply
    1,613.72x = 2,421.78 × 626.69
  4. Step 4: Simplify right side
    1,613.72x = 1,517,693.20
  5. Step 5: Solve for x
    x = 1,517,693.20/1,613.72
  6. Step 6: Final answer
    x = 940.50

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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.