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Finding the Fourth Proportional to 288.48, 432.30 and 215.02

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Solution

The fourth proportional to 288.48, 432.30 and 215.02 is: 322.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.48 : 432.30 = 215.02 : x
  2. Step 2: Convert to fraction form
    288.48/432.30 = 215.02/x
  3. Step 3: Cross multiply
    288.48x = 432.30 × 215.02
  4. Step 4: Simplify right side
    288.48x = 92,950.98
  5. Step 5: Solve for x
    x = 92,950.98/288.48
  6. Step 6: Final answer
    x = 322.21

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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.