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Finding the Fourth Proportional to 930.12, 1,395.88 and 491.31

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Solution

The fourth proportional to 930.12, 1,395.88 and 491.31 is: 737.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.12 : 1,395.88 = 491.31 : x
  2. Step 2: Convert to fraction form
    930.12/1,395.88 = 491.31/x
  3. Step 3: Cross multiply
    930.12x = 1,395.88 × 491.31
  4. Step 4: Simplify right side
    930.12x = 685,803.61
  5. Step 5: Solve for x
    x = 685,803.61/930.12
  6. Step 6: Final answer
    x = 737.33

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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.