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Finding the Fourth Proportional to 697.82, 1,045.56 and 491.45

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Solution

The fourth proportional to 697.82, 1,045.56 and 491.45 is: 736.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.82 : 1,045.56 = 491.45 : x
  2. Step 2: Convert to fraction form
    697.82/1,045.56 = 491.45/x
  3. Step 3: Cross multiply
    697.82x = 1,045.56 × 491.45
  4. Step 4: Simplify right side
    697.82x = 513,840.46
  5. Step 5: Solve for x
    x = 513,840.46/697.82
  6. Step 6: Final answer
    x = 736.35

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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.