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Finding the Fourth Proportional to 923.75, 1,386.57 and 720.54

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Solution

The fourth proportional to 923.75, 1,386.57 and 720.54 is: 1,081.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.75 : 1,386.57 = 720.54 : x
  2. Step 2: Convert to fraction form
    923.75/1,386.57 = 720.54/x
  3. Step 3: Cross multiply
    923.75x = 1,386.57 × 720.54
  4. Step 4: Simplify right side
    923.75x = 999,081.85
  5. Step 5: Solve for x
    x = 999,081.85/923.75
  6. Step 6: Final answer
    x = 1,081.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.