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Finding the Fourth Proportional to 931.78, 1,396.60 and 521.10

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Solution

The fourth proportional to 931.78, 1,396.60 and 521.10 is: 781.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.78 : 1,396.60 = 521.10 : x
  2. Step 2: Convert to fraction form
    931.78/1,396.60 = 521.10/x
  3. Step 3: Cross multiply
    931.78x = 1,396.60 × 521.10
  4. Step 4: Simplify right side
    931.78x = 727,768.26
  5. Step 5: Solve for x
    x = 727,768.26/931.78
  6. Step 6: Final answer
    x = 781.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.