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Finding the Fourth Proportional to 695.63, 959.90 and 400.91

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Solution

The fourth proportional to 695.63, 959.90 and 400.91 is: 553.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.63 : 959.90 = 400.91 : x
  2. Step 2: Convert to fraction form
    695.63/959.90 = 400.91/x
  3. Step 3: Cross multiply
    695.63x = 959.90 × 400.91
  4. Step 4: Simplify right side
    695.63x = 384,831.50
  5. Step 5: Solve for x
    x = 384,831.50/695.63
  6. Step 6: Final answer
    x = 553.21

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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.