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Finding the Fourth Proportional to 931.35, 1,397.35 and 620.25

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Solution

The fourth proportional to 931.35, 1,397.35 and 620.25 is: 930.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.35 : 1,397.35 = 620.25 : x
  2. Step 2: Convert to fraction form
    931.35/1,397.35 = 620.25/x
  3. Step 3: Cross multiply
    931.35x = 1,397.35 × 620.25
  4. Step 4: Simplify right side
    931.35x = 866,706.34
  5. Step 5: Solve for x
    x = 866,706.34/931.35
  6. Step 6: Final answer
    x = 930.59

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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.