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Finding the Fourth Proportional to 314.99, 434.90 and 281.69

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Solution

The fourth proportional to 314.99, 434.90 and 281.69 is: 388.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.99 : 434.90 = 281.69 : x
  2. Step 2: Convert to fraction form
    314.99/434.90 = 281.69/x
  3. Step 3: Cross multiply
    314.99x = 434.90 × 281.69
  4. Step 4: Simplify right side
    314.99x = 122,509.59
  5. Step 5: Solve for x
    x = 122,509.59/314.99
  6. Step 6: Final answer
    x = 388.93

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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.