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Finding the Fourth Proportional to 763.91, 1,054.21 and 414.60

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Solution

The fourth proportional to 763.91, 1,054.21 and 414.60 is: 572.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.91 : 1,054.21 = 414.60 : x
  2. Step 2: Convert to fraction form
    763.91/1,054.21 = 414.60/x
  3. Step 3: Cross multiply
    763.91x = 1,054.21 × 414.60
  4. Step 4: Simplify right side
    763.91x = 437,076.02
  5. Step 5: Solve for x
    x = 437,076.02/763.91
  6. Step 6: Final answer
    x = 572.15

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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.