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Finding the Fourth Proportional to 930.51, 1,395.90 and 345.36

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Solution

The fourth proportional to 930.51, 1,395.90 and 345.36 is: 518.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.51 : 1,395.90 = 345.36 : x
  2. Step 2: Convert to fraction form
    930.51/1,395.90 = 345.36/x
  3. Step 3: Cross multiply
    930.51x = 1,395.90 × 345.36
  4. Step 4: Simplify right side
    930.51x = 482,088.02
  5. Step 5: Solve for x
    x = 482,088.02/930.51
  6. Step 6: Final answer
    x = 518.09

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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.