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Finding the Fourth Proportional to 762.17, 1,051.80 and 447.64

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Solution

The fourth proportional to 762.17, 1,051.80 and 447.64 is: 617.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.17 : 1,051.80 = 447.64 : x
  2. Step 2: Convert to fraction form
    762.17/1,051.80 = 447.64/x
  3. Step 3: Cross multiply
    762.17x = 1,051.80 × 447.64
  4. Step 4: Simplify right side
    762.17x = 470,827.75
  5. Step 5: Solve for x
    x = 470,827.75/762.17
  6. Step 6: Final answer
    x = 617.75

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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.