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Finding the Fourth Proportional to 451.18, 621.72 and 434.98

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Solution

The fourth proportional to 451.18, 621.72 and 434.98 is: 599.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.18 : 621.72 = 434.98 : x
  2. Step 2: Convert to fraction form
    451.18/621.72 = 434.98/x
  3. Step 3: Cross multiply
    451.18x = 621.72 × 434.98
  4. Step 4: Simplify right side
    451.18x = 270,435.77
  5. Step 5: Solve for x
    x = 270,435.77/451.18
  6. Step 6: Final answer
    x = 599.40

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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.