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Finding the Fourth Proportional to 718.66, 1,078.22 and 280.05

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Solution

The fourth proportional to 718.66, 1,078.22 and 280.05 is: 420.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.66 : 1,078.22 = 280.05 : x
  2. Step 2: Convert to fraction form
    718.66/1,078.22 = 280.05/x
  3. Step 3: Cross multiply
    718.66x = 1,078.22 × 280.05
  4. Step 4: Simplify right side
    718.66x = 301,955.51
  5. Step 5: Solve for x
    x = 301,955.51/718.66
  6. Step 6: Final answer
    x = 420.16

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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.