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Finding the Fourth Proportional to 930.19, 1,395.36 and 313.89

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Solution

The fourth proportional to 930.19, 1,395.36 and 313.89 is: 470.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.19 : 1,395.36 = 313.89 : x
  2. Step 2: Convert to fraction form
    930.19/1,395.36 = 313.89/x
  3. Step 3: Cross multiply
    930.19x = 1,395.36 × 313.89
  4. Step 4: Simplify right side
    930.19x = 437,989.55
  5. Step 5: Solve for x
    x = 437,989.55/930.19
  6. Step 6: Final answer
    x = 470.86

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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.