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Finding the Fourth Proportional to 699.16, 1,048.38 and 439.12

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Solution

The fourth proportional to 699.16, 1,048.38 and 439.12 is: 658.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.16 : 1,048.38 = 439.12 : x
  2. Step 2: Convert to fraction form
    699.16/1,048.38 = 439.12/x
  3. Step 3: Cross multiply
    699.16x = 1,048.38 × 439.12
  4. Step 4: Simplify right side
    699.16x = 460,364.63
  5. Step 5: Solve for x
    x = 460,364.63/699.16
  6. Step 6: Final answer
    x = 658.45

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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.