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Finding the Fourth Proportional to 709.48, 1,064.63 and 319.50

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Solution

The fourth proportional to 709.48, 1,064.63 and 319.50 is: 479.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.48 : 1,064.63 = 319.50 : x
  2. Step 2: Convert to fraction form
    709.48/1,064.63 = 319.50/x
  3. Step 3: Cross multiply
    709.48x = 1,064.63 × 319.50
  4. Step 4: Simplify right side
    709.48x = 340,150.08
  5. Step 5: Solve for x
    x = 340,150.08/709.48
  6. Step 6: Final answer
    x = 479.44

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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.