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Finding the Fourth Proportional to 288.87, 432.47 and 259.20

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Solution

The fourth proportional to 288.87, 432.47 and 259.20 is: 388.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.87 : 432.47 = 259.20 : x
  2. Step 2: Convert to fraction form
    288.87/432.47 = 259.20/x
  3. Step 3: Cross multiply
    288.87x = 432.47 × 259.20
  4. Step 4: Simplify right side
    288.87x = 112,096.22
  5. Step 5: Solve for x
    x = 112,096.22/288.87
  6. Step 6: Final answer
    x = 388.05

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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.