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Finding the Fourth Proportional to 898.90, 1,240.92 and 650.78

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Solution

The fourth proportional to 898.90, 1,240.92 and 650.78 is: 898.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.90 : 1,240.92 = 650.78 : x
  2. Step 2: Convert to fraction form
    898.90/1,240.92 = 650.78/x
  3. Step 3: Cross multiply
    898.90x = 1,240.92 × 650.78
  4. Step 4: Simplify right side
    898.90x = 807,571.35
  5. Step 5: Solve for x
    x = 807,571.35/898.90
  6. Step 6: Final answer
    x = 898.40

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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.