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Finding the Fourth Proportional to 409.50, 564.84 and 392.40

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Solution

The fourth proportional to 409.50, 564.84 and 392.40 is: 541.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.50 : 564.84 = 392.40 : x
  2. Step 2: Convert to fraction form
    409.50/564.84 = 392.40/x
  3. Step 3: Cross multiply
    409.50x = 564.84 × 392.40
  4. Step 4: Simplify right side
    409.50x = 221,643.22
  5. Step 5: Solve for x
    x = 221,643.22/409.50
  6. Step 6: Final answer
    x = 541.25

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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.