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Finding the Fourth Proportional to 407.28, 563.04 and 390.18

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Solution

The fourth proportional to 407.28, 563.04 and 390.18 is: 539.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.28 : 563.04 = 390.18 : x
  2. Step 2: Convert to fraction form
    407.28/563.04 = 390.18/x
  3. Step 3: Cross multiply
    407.28x = 563.04 × 390.18
  4. Step 4: Simplify right side
    407.28x = 219,686.95
  5. Step 5: Solve for x
    x = 219,686.95/407.28
  6. Step 6: Final answer
    x = 539.40

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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.