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Finding the Fourth Proportional to 374.28, 561.90 and 259.48

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Solution

The fourth proportional to 374.28, 561.90 and 259.48 is: 389.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.28 : 561.90 = 259.48 : x
  2. Step 2: Convert to fraction form
    374.28/561.90 = 259.48/x
  3. Step 3: Cross multiply
    374.28x = 561.90 × 259.48
  4. Step 4: Simplify right side
    374.28x = 145,801.81
  5. Step 5: Solve for x
    x = 145,801.81/374.28
  6. Step 6: Final answer
    x = 389.55

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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.