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Finding the Fourth Proportional to 469.57, 647.85 and 303.99

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Solution

The fourth proportional to 469.57, 647.85 and 303.99 is: 419.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.57 : 647.85 = 303.99 : x
  2. Step 2: Convert to fraction form
    469.57/647.85 = 303.99/x
  3. Step 3: Cross multiply
    469.57x = 647.85 × 303.99
  4. Step 4: Simplify right side
    469.57x = 196,939.92
  5. Step 5: Solve for x
    x = 196,939.92/469.57
  6. Step 6: Final answer
    x = 419.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.