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Finding the Fourth Proportional to 679.48, 1,019.86 and 436.16

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Solution

The fourth proportional to 679.48, 1,019.86 and 436.16 is: 654.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.48 : 1,019.86 = 436.16 : x
  2. Step 2: Convert to fraction form
    679.48/1,019.86 = 436.16/x
  3. Step 3: Cross multiply
    679.48x = 1,019.86 × 436.16
  4. Step 4: Simplify right side
    679.48x = 444,822.14
  5. Step 5: Solve for x
    x = 444,822.14/679.48
  6. Step 6: Final answer
    x = 654.65

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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.