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Finding the Fourth Proportional to 280.04, 386.51 and 214.70

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Solution

The fourth proportional to 280.04, 386.51 and 214.70 is: 296.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.04 : 386.51 = 214.70 : x
  2. Step 2: Convert to fraction form
    280.04/386.51 = 214.70/x
  3. Step 3: Cross multiply
    280.04x = 386.51 × 214.70
  4. Step 4: Simplify right side
    280.04x = 82,980.69
  5. Step 5: Solve for x
    x = 82,980.69/280.04
  6. Step 6: Final answer
    x = 296.32

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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.