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Finding the Fourth Proportional to 1,613.52, 2,418.75 and 638.91

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Solution

The fourth proportional to 1,613.52, 2,418.75 and 638.91 is: 957.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.52 : 2,418.75 = 638.91 : x
  2. Step 2: Convert to fraction form
    1,613.52/2,418.75 = 638.91/x
  3. Step 3: Cross multiply
    1,613.52x = 2,418.75 × 638.91
  4. Step 4: Simplify right side
    1,613.52x = 1,545,363.56
  5. Step 5: Solve for x
    x = 1,545,363.56/1,613.52
  6. Step 6: Final answer
    x = 957.76

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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.