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Finding the Fourth Proportional to 684.12, 1,025.91 and 442.20

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Solution

The fourth proportional to 684.12, 1,025.91 and 442.20 is: 663.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.12 : 1,025.91 = 442.20 : x
  2. Step 2: Convert to fraction form
    684.12/1,025.91 = 442.20/x
  3. Step 3: Cross multiply
    684.12x = 1,025.91 × 442.20
  4. Step 4: Simplify right side
    684.12x = 453,657.40
  5. Step 5: Solve for x
    x = 453,657.40/684.12
  6. Step 6: Final answer
    x = 663.13

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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.