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Finding the Fourth Proportional to 669.24, 1,002.60 and 486.72

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Solution

The fourth proportional to 669.24, 1,002.60 and 486.72 is: 729.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.24 : 1,002.60 = 486.72 : x
  2. Step 2: Convert to fraction form
    669.24/1,002.60 = 486.72/x
  3. Step 3: Cross multiply
    669.24x = 1,002.60 × 486.72
  4. Step 4: Simplify right side
    669.24x = 487,985.47
  5. Step 5: Solve for x
    x = 487,985.47/669.24
  6. Step 6: Final answer
    x = 729.16

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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.