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Finding the Fourth Proportional to 740.89, 1,024.28 and 648.55

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Solution

The fourth proportional to 740.89, 1,024.28 and 648.55 is: 896.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.89 : 1,024.28 = 648.55 : x
  2. Step 2: Convert to fraction form
    740.89/1,024.28 = 648.55/x
  3. Step 3: Cross multiply
    740.89x = 1,024.28 × 648.55
  4. Step 4: Simplify right side
    740.89x = 664,296.79
  5. Step 5: Solve for x
    x = 664,296.79/740.89
  6. Step 6: Final answer
    x = 896.62

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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.