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Finding the Fourth Proportional to 502.40, 692.88 and 325.20

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Solution

The fourth proportional to 502.40, 692.88 and 325.20 is: 448.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    502.40 : 692.88 = 325.20 : x
  2. Step 2: Convert to fraction form
    502.40/692.88 = 325.20/x
  3. Step 3: Cross multiply
    502.40x = 692.88 × 325.20
  4. Step 4: Simplify right side
    502.40x = 225,324.58
  5. Step 5: Solve for x
    x = 225,324.58/502.40
  6. Step 6: Final answer
    x = 448.50

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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.