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Finding the Fourth Proportional to 696.47, 1,045.10 and 641.39

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Solution

The fourth proportional to 696.47, 1,045.10 and 641.39 is: 962.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.47 : 1,045.10 = 641.39 : x
  2. Step 2: Convert to fraction form
    696.47/1,045.10 = 641.39/x
  3. Step 3: Cross multiply
    696.47x = 1,045.10 × 641.39
  4. Step 4: Simplify right side
    696.47x = 670,313.07
  5. Step 5: Solve for x
    x = 670,313.07/696.47
  6. Step 6: Final answer
    x = 962.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.