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Finding the Fourth Proportional to 931.56, 1,285.68 and 698.28

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Solution

The fourth proportional to 931.56, 1,285.68 and 698.28 is: 963.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.56 : 1,285.68 = 698.28 : x
  2. Step 2: Convert to fraction form
    931.56/1,285.68 = 698.28/x
  3. Step 3: Cross multiply
    931.56x = 1,285.68 × 698.28
  4. Step 4: Simplify right side
    931.56x = 897,764.63
  5. Step 5: Solve for x
    x = 897,764.63/931.56
  6. Step 6: Final answer
    x = 963.72

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1.5x scale

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.