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Finding the Fourth Proportional to 718.94, 1,078.18 and 280.16

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Solution

The fourth proportional to 718.94, 1,078.18 and 280.16 is: 420.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.94 : 1,078.18 = 280.16 : x
  2. Step 2: Convert to fraction form
    718.94/1,078.18 = 280.16/x
  3. Step 3: Cross multiply
    718.94x = 1,078.18 × 280.16
  4. Step 4: Simplify right side
    718.94x = 302,062.91
  5. Step 5: Solve for x
    x = 302,062.91/718.94
  6. Step 6: Final answer
    x = 420.15

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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.