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Finding the Fourth Proportional to 762.30, 1,051.44 and 478.80

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Solution

The fourth proportional to 762.30, 1,051.44 and 478.80 is: 660.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.30 : 1,051.44 = 478.80 : x
  2. Step 2: Convert to fraction form
    762.30/1,051.44 = 478.80/x
  3. Step 3: Cross multiply
    762.30x = 1,051.44 × 478.80
  4. Step 4: Simplify right side
    762.30x = 503,429.47
  5. Step 5: Solve for x
    x = 503,429.47/762.30
  6. Step 6: Final answer
    x = 660.41

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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.