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Finding the Fourth Proportional to 931.42, 1,397.94 and 607.24

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Solution

The fourth proportional to 931.42, 1,397.94 and 607.24 is: 911.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.42 : 1,397.94 = 607.24 : x
  2. Step 2: Convert to fraction form
    931.42/1,397.94 = 607.24/x
  3. Step 3: Cross multiply
    931.42x = 1,397.94 × 607.24
  4. Step 4: Simplify right side
    931.42x = 848,885.09
  5. Step 5: Solve for x
    x = 848,885.09/931.42
  6. Step 6: Final answer
    x = 911.39

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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.