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Finding the Fourth Proportional to 718.11, 1,077.15 and 393.30

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Solution

The fourth proportional to 718.11, 1,077.15 and 393.30 is: 589.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.11 : 1,077.15 = 393.30 : x
  2. Step 2: Convert to fraction form
    718.11/1,077.15 = 393.30/x
  3. Step 3: Cross multiply
    718.11x = 1,077.15 × 393.30
  4. Step 4: Simplify right side
    718.11x = 423,643.10
  5. Step 5: Solve for x
    x = 423,643.10/718.11
  6. Step 6: Final answer
    x = 589.94

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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.