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Finding the Fourth Proportional to 766.25, 1,056.96 and 485.99

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Solution

The fourth proportional to 766.25, 1,056.96 and 485.99 is: 670.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.25 : 1,056.96 = 485.99 : x
  2. Step 2: Convert to fraction form
    766.25/1,056.96 = 485.99/x
  3. Step 3: Cross multiply
    766.25x = 1,056.96 × 485.99
  4. Step 4: Simplify right side
    766.25x = 513,671.99
  5. Step 5: Solve for x
    x = 513,671.99/766.25
  6. Step 6: Final answer
    x = 670.37

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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.