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Finding the Fourth Proportional to 559.40, 837.90 and 487.40

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Solution

The fourth proportional to 559.40, 837.90 and 487.40 is: 730.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.40 : 837.90 = 487.40 : x
  2. Step 2: Convert to fraction form
    559.40/837.90 = 487.40/x
  3. Step 3: Cross multiply
    559.40x = 837.90 × 487.40
  4. Step 4: Simplify right side
    559.40x = 408,392.46
  5. Step 5: Solve for x
    x = 408,392.46/559.40
  6. Step 6: Final answer
    x = 730.05

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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.