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Finding the Fourth Proportional to 530.80, 794.40 and 487.60

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Solution

The fourth proportional to 530.80, 794.40 and 487.60 is: 729.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.80 : 794.40 = 487.60 : x
  2. Step 2: Convert to fraction form
    530.80/794.40 = 487.60/x
  3. Step 3: Cross multiply
    530.80x = 794.40 × 487.60
  4. Step 4: Simplify right side
    530.80x = 387,349.44
  5. Step 5: Solve for x
    x = 387,349.44/530.80
  6. Step 6: Final answer
    x = 729.75

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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.