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Finding the Fourth Proportional to 315.90, 434.97 and 283.50

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Solution

The fourth proportional to 315.90, 434.97 and 283.50 is: 390.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.90 : 434.97 = 283.50 : x
  2. Step 2: Convert to fraction form
    315.90/434.97 = 283.50/x
  3. Step 3: Cross multiply
    315.90x = 434.97 × 283.50
  4. Step 4: Simplify right side
    315.90x = 123,314.00
  5. Step 5: Solve for x
    x = 123,314.00/315.90
  6. Step 6: Final answer
    x = 390.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.