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Finding the Fourth Proportional to 863.48, 1,191.61 and 470.51

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Solution

The fourth proportional to 863.48, 1,191.61 and 470.51 is: 649.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.48 : 1,191.61 = 470.51 : x
  2. Step 2: Convert to fraction form
    863.48/1,191.61 = 470.51/x
  3. Step 3: Cross multiply
    863.48x = 1,191.61 × 470.51
  4. Step 4: Simplify right side
    863.48x = 560,664.42
  5. Step 5: Solve for x
    x = 560,664.42/863.48
  6. Step 6: Final answer
    x = 649.31

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1.5x scale

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.