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Finding the Fourth Proportional to 690.05, 951.88 and 454.03

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Solution

The fourth proportional to 690.05, 951.88 and 454.03 is: 626.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.05 : 951.88 = 454.03 : x
  2. Step 2: Convert to fraction form
    690.05/951.88 = 454.03/x
  3. Step 3: Cross multiply
    690.05x = 951.88 × 454.03
  4. Step 4: Simplify right side
    690.05x = 432,182.13
  5. Step 5: Solve for x
    x = 432,182.13/690.05
  6. Step 6: Final answer
    x = 626.31

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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.