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Finding the Fourth Proportional to 931.44, 1,285.38 and 669.72

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Solution

The fourth proportional to 931.44, 1,285.38 and 669.72 is: 924.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.44 : 1,285.38 = 669.72 : x
  2. Step 2: Convert to fraction form
    931.44/1,285.38 = 669.72/x
  3. Step 3: Cross multiply
    931.44x = 1,285.38 × 669.72
  4. Step 4: Simplify right side
    931.44x = 860,844.69
  5. Step 5: Solve for x
    x = 860,844.69/931.44
  6. Step 6: Final answer
    x = 924.21

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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.