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Finding the Fourth Proportional to 280.86, 387.66 and 253.50

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Solution

The fourth proportional to 280.86, 387.66 and 253.50 is: 349.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.86 : 387.66 = 253.50 : x
  2. Step 2: Convert to fraction form
    280.86/387.66 = 253.50/x
  3. Step 3: Cross multiply
    280.86x = 387.66 × 253.50
  4. Step 4: Simplify right side
    280.86x = 98,271.81
  5. Step 5: Solve for x
    x = 98,271.81/280.86
  6. Step 6: Final answer
    x = 349.90

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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.