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Finding the Fourth Proportional to 537.20, 805.80 and 407.60

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Solution

The fourth proportional to 537.20, 805.80 and 407.60 is: 611.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    537.20 : 805.80 = 407.60 : x
  2. Step 2: Convert to fraction form
    537.20/805.80 = 407.60/x
  3. Step 3: Cross multiply
    537.20x = 805.80 × 407.60
  4. Step 4: Simplify right side
    537.20x = 328,444.08
  5. Step 5: Solve for x
    x = 328,444.08/537.20
  6. Step 6: Final answer
    x = 611.40

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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.