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Finding the Fourth Proportional to 1,739.48, 2,609.30 and 643.24

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Solution

The fourth proportional to 1,739.48, 2,609.30 and 643.24 is: 964.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,739.48 : 2,609.30 = 643.24 : x
  2. Step 2: Convert to fraction form
    1,739.48/2,609.30 = 643.24/x
  3. Step 3: Cross multiply
    1,739.48x = 2,609.30 × 643.24
  4. Step 4: Simplify right side
    1,739.48x = 1,678,406.13
  5. Step 5: Solve for x
    x = 1,678,406.13/1,739.48
  6. Step 6: Final answer
    x = 964.89

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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.