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Finding the Fourth Proportional to 684.28, 1,026.42 and 555.76

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Solution

The fourth proportional to 684.28, 1,026.42 and 555.76 is: 833.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.28 : 1,026.42 = 555.76 : x
  2. Step 2: Convert to fraction form
    684.28/1,026.42 = 555.76/x
  3. Step 3: Cross multiply
    684.28x = 1,026.42 × 555.76
  4. Step 4: Simplify right side
    684.28x = 570,443.18
  5. Step 5: Solve for x
    x = 570,443.18/684.28
  6. Step 6: Final answer
    x = 833.64

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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.