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Finding the Fourth Proportional to 883.86, 1,220.13 and 663.54

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Solution

The fourth proportional to 883.86, 1,220.13 and 663.54 is: 915.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.86 : 1,220.13 = 663.54 : x
  2. Step 2: Convert to fraction form
    883.86/1,220.13 = 663.54/x
  3. Step 3: Cross multiply
    883.86x = 1,220.13 × 663.54
  4. Step 4: Simplify right side
    883.86x = 809,605.06
  5. Step 5: Solve for x
    x = 809,605.06/883.86
  6. Step 6: Final answer
    x = 915.99

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1.5x scale

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.