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Finding the Fourth Proportional to 697.72, 1,045.88 and 454.40

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Solution

The fourth proportional to 697.72, 1,045.88 and 454.40 is: 681.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.72 : 1,045.88 = 454.40 : x
  2. Step 2: Convert to fraction form
    697.72/1,045.88 = 454.40/x
  3. Step 3: Cross multiply
    697.72x = 1,045.88 × 454.40
  4. Step 4: Simplify right side
    697.72x = 475,247.87
  5. Step 5: Solve for x
    x = 475,247.87/697.72
  6. Step 6: Final answer
    x = 681.14

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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.