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Finding the Fourth Proportional to 288.60, 432.60 and 143.88

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Solution

The fourth proportional to 288.60, 432.60 and 143.88 is: 215.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.60 : 432.60 = 143.88 : x
  2. Step 2: Convert to fraction form
    288.60/432.60 = 143.88/x
  3. Step 3: Cross multiply
    288.60x = 432.60 × 143.88
  4. Step 4: Simplify right side
    288.60x = 62,242.49
  5. Step 5: Solve for x
    x = 62,242.49/288.60
  6. Step 6: Final answer
    x = 215.67

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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.