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Finding the Fourth Proportional to 406.51, 560.05 and 319.03

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Solution

The fourth proportional to 406.51, 560.05 and 319.03 is: 439.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.51 : 560.05 = 319.03 : x
  2. Step 2: Convert to fraction form
    406.51/560.05 = 319.03/x
  3. Step 3: Cross multiply
    406.51x = 560.05 × 319.03
  4. Step 4: Simplify right side
    406.51x = 178,672.75
  5. Step 5: Solve for x
    x = 178,672.75/406.51
  6. Step 6: Final answer
    x = 439.53

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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.