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Finding the Fourth Proportional to 869.02, 1,303.15 and 406.70

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Solution

The fourth proportional to 869.02, 1,303.15 and 406.70 is: 609.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.02 : 1,303.15 = 406.70 : x
  2. Step 2: Convert to fraction form
    869.02/1,303.15 = 406.70/x
  3. Step 3: Cross multiply
    869.02x = 1,303.15 × 406.70
  4. Step 4: Simplify right side
    869.02x = 529,991.11
  5. Step 5: Solve for x
    x = 529,991.11/869.02
  6. Step 6: Final answer
    x = 609.87

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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.