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Finding the Fourth Proportional to 464.12, 695.91 and 139.40

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Solution

The fourth proportional to 464.12, 695.91 and 139.40 is: 209.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.12 : 695.91 = 139.40 : x
  2. Step 2: Convert to fraction form
    464.12/695.91 = 139.40/x
  3. Step 3: Cross multiply
    464.12x = 695.91 × 139.40
  4. Step 4: Simplify right side
    464.12x = 97,009.85
  5. Step 5: Solve for x
    x = 97,009.85/464.12
  6. Step 6: Final answer
    x = 209.02

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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.