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Finding the Fourth Proportional to 684.24, 1,019.10 and 671.28

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Solution

The fourth proportional to 684.24, 1,019.10 and 671.28 is: 999.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.24 : 1,019.10 = 671.28 : x
  2. Step 2: Convert to fraction form
    684.24/1,019.10 = 671.28/x
  3. Step 3: Cross multiply
    684.24x = 1,019.10 × 671.28
  4. Step 4: Simplify right side
    684.24x = 684,101.45
  5. Step 5: Solve for x
    x = 684,101.45/684.24
  6. Step 6: Final answer
    x = 999.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.