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Finding the Fourth Proportional to 931.15, 1,284.42 and 669.52

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Solution

The fourth proportional to 931.15, 1,284.42 and 669.52 is: 923.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.15 : 1,284.42 = 669.52 : x
  2. Step 2: Convert to fraction form
    931.15/1,284.42 = 669.52/x
  3. Step 3: Cross multiply
    931.15x = 1,284.42 × 669.52
  4. Step 4: Simplify right side
    931.15x = 859,944.88
  5. Step 5: Solve for x
    x = 859,944.88/931.15
  6. Step 6: Final answer
    x = 923.53

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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.