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Finding the Fourth Proportional to 931.87, 1,285.80 and 633.35

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Solution

The fourth proportional to 931.87, 1,285.80 and 633.35 is: 873.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.87 : 1,285.80 = 633.35 : x
  2. Step 2: Convert to fraction form
    931.87/1,285.80 = 633.35/x
  3. Step 3: Cross multiply
    931.87x = 1,285.80 × 633.35
  4. Step 4: Simplify right side
    931.87x = 814,364.64
  5. Step 5: Solve for x
    x = 814,364.64/931.87
  6. Step 6: Final answer
    x = 873.91

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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.