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Finding the Fourth Proportional to 719.48, 987.12 and 684.65

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Solution

The fourth proportional to 719.48, 987.12 and 684.65 is: 939.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.48 : 987.12 = 684.65 : x
  2. Step 2: Convert to fraction form
    719.48/987.12 = 684.65/x
  3. Step 3: Cross multiply
    719.48x = 987.12 × 684.65
  4. Step 4: Simplify right side
    719.48x = 675,834.18
  5. Step 5: Solve for x
    x = 675,834.18/719.48
  6. Step 6: Final answer
    x = 939.33

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.