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Finding the Fourth Proportional to 280.07, 386.50 and 155.74

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Solution

The fourth proportional to 280.07, 386.50 and 155.74 is: 214.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.07 : 386.50 = 155.74 : x
  2. Step 2: Convert to fraction form
    280.07/386.50 = 155.74/x
  3. Step 3: Cross multiply
    280.07x = 386.50 × 155.74
  4. Step 4: Simplify right side
    280.07x = 60,193.51
  5. Step 5: Solve for x
    x = 60,193.51/280.07
  6. Step 6: Final answer
    x = 214.92

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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.