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Finding the Fourth Proportional to 502.40, 692.88 and 419.28

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Solution

The fourth proportional to 502.40, 692.88 and 419.28 is: 578.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    502.40 : 692.88 = 419.28 : x
  2. Step 2: Convert to fraction form
    502.40/692.88 = 419.28/x
  3. Step 3: Cross multiply
    502.40x = 692.88 × 419.28
  4. Step 4: Simplify right side
    502.40x = 290,510.73
  5. Step 5: Solve for x
    x = 290,510.73/502.40
  6. Step 6: Final answer
    x = 578.25

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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.