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Finding the Fourth Proportional to 684, 942.66 and 631.80

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Solution

The fourth proportional to 684, 942.66 and 631.80 is: 870.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    684 : 942.66 = 631.80 : x
  2. Step 2: Convert to fraction form
    684/942.66 = 631.80/x
  3. Step 3: Cross multiply
    684x = 942.66 × 631.80
  4. Step 4: Simplify right side
    684x = 595,572.59
  5. Step 5: Solve for x
    x = 595,572.59/684
  6. Step 6: Final answer
    x = 870.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.