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Finding the Fourth Proportional to 679.13, 1,018.54 and 313.57

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Solution

The fourth proportional to 679.13, 1,018.54 and 313.57 is: 470.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.13 : 1,018.54 = 313.57 : x
  2. Step 2: Convert to fraction form
    679.13/1,018.54 = 313.57/x
  3. Step 3: Cross multiply
    679.13x = 1,018.54 × 313.57
  4. Step 4: Simplify right side
    679.13x = 319,378.50
  5. Step 5: Solve for x
    x = 319,378.50/679.13
  6. Step 6: Final answer
    x = 470.28

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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.