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Finding the Fourth Proportional to 740.72, 1,021.74 and 641.90

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Solution

The fourth proportional to 740.72, 1,021.74 and 641.90 is: 885.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.72 : 1,021.74 = 641.90 : x
  2. Step 2: Convert to fraction form
    740.72/1,021.74 = 641.90/x
  3. Step 3: Cross multiply
    740.72x = 1,021.74 × 641.90
  4. Step 4: Simplify right side
    740.72x = 655,854.91
  5. Step 5: Solve for x
    x = 655,854.91/740.72
  6. Step 6: Final answer
    x = 885.43

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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.