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Finding the Fourth Proportional to 930.42, 1,395.47 and 345.71

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Solution

The fourth proportional to 930.42, 1,395.47 and 345.71 is: 518.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.42 : 1,395.47 = 345.71 : x
  2. Step 2: Convert to fraction form
    930.42/1,395.47 = 345.71/x
  3. Step 3: Cross multiply
    930.42x = 1,395.47 × 345.71
  4. Step 4: Simplify right side
    930.42x = 482,419.23
  5. Step 5: Solve for x
    x = 482,419.23/930.42
  6. Step 6: Final answer
    x = 518.50

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Double scale
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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.