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Finding the Fourth Proportional to 816.98, 1,127.25 and 485.51

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Solution

The fourth proportional to 816.98, 1,127.25 and 485.51 is: 669.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.98 : 1,127.25 = 485.51 : x
  2. Step 2: Convert to fraction form
    816.98/1,127.25 = 485.51/x
  3. Step 3: Cross multiply
    816.98x = 1,127.25 × 485.51
  4. Step 4: Simplify right side
    816.98x = 547,285.51
  5. Step 5: Solve for x
    x = 547,285.51/816.98
  6. Step 6: Final answer
    x = 669.89

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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.