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Finding the Fourth Proportional to 684.48, 1,026.03 and 391.89

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Solution

The fourth proportional to 684.48, 1,026.03 and 391.89 is: 587.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.48 : 1,026.03 = 391.89 : x
  2. Step 2: Convert to fraction form
    684.48/1,026.03 = 391.89/x
  3. Step 3: Cross multiply
    684.48x = 1,026.03 × 391.89
  4. Step 4: Simplify right side
    684.48x = 402,090.90
  5. Step 5: Solve for x
    x = 402,090.90/684.48
  6. Step 6: Final answer
    x = 587.44

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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.