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Finding the Fourth Proportional to 740.36, 1,021.25 and 641.94

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Solution

The fourth proportional to 740.36, 1,021.25 and 641.94 is: 885.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.36 : 1,021.25 = 641.94 : x
  2. Step 2: Convert to fraction form
    740.36/1,021.25 = 641.94/x
  3. Step 3: Cross multiply
    740.36x = 1,021.25 × 641.94
  4. Step 4: Simplify right side
    740.36x = 655,578.02
  5. Step 5: Solve for x
    x = 655,578.02/740.36
  6. Step 6: Final answer
    x = 885.49

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Double scale
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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.