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Finding the Fourth Proportional to 920.79, 1,270.47 and 626.22

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Solution

The fourth proportional to 920.79, 1,270.47 and 626.22 is: 864.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.79 : 1,270.47 = 626.22 : x
  2. Step 2: Convert to fraction form
    920.79/1,270.47 = 626.22/x
  3. Step 3: Cross multiply
    920.79x = 1,270.47 × 626.22
  4. Step 4: Simplify right side
    920.79x = 795,593.72
  5. Step 5: Solve for x
    x = 795,593.72/920.79
  6. Step 6: Final answer
    x = 864.03

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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.