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Finding the Fourth Proportional to 896.72, 1,237.55 and 498.40

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Solution

The fourth proportional to 896.72, 1,237.55 and 498.40 is: 687.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.72 : 1,237.55 = 498.40 : x
  2. Step 2: Convert to fraction form
    896.72/1,237.55 = 498.40/x
  3. Step 3: Cross multiply
    896.72x = 1,237.55 × 498.40
  4. Step 4: Simplify right side
    896.72x = 616,789.33
  5. Step 5: Solve for x
    x = 616,789.33/896.72
  6. Step 6: Final answer
    x = 687.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.