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Finding the Fourth Proportional to 931.40, 1,284.04 and 704.12

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Solution

The fourth proportional to 931.40, 1,284.04 and 704.12 is: 970.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.40 : 1,284.04 = 704.12 : x
  2. Step 2: Convert to fraction form
    931.40/1,284.04 = 704.12/x
  3. Step 3: Cross multiply
    931.40x = 1,284.04 × 704.12
  4. Step 4: Simplify right side
    931.40x = 904,118.24
  5. Step 5: Solve for x
    x = 904,118.24/931.40
  6. Step 6: Final answer
    x = 970.71

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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.