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Finding the Fourth Proportional to 885.79, 1,223.57 and 722.07

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Solution

The fourth proportional to 885.79, 1,223.57 and 722.07 is: 997.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.79 : 1,223.57 = 722.07 : x
  2. Step 2: Convert to fraction form
    885.79/1,223.57 = 722.07/x
  3. Step 3: Cross multiply
    885.79x = 1,223.57 × 722.07
  4. Step 4: Simplify right side
    885.79x = 883,505.00
  5. Step 5: Solve for x
    x = 883,505.00/885.79
  6. Step 6: Final answer
    x = 997.42

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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.