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Finding the Fourth Proportional to 710.20, 1,064.40 and 319.79

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Solution

The fourth proportional to 710.20, 1,064.40 and 319.79 is: 479.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.20 : 1,064.40 = 319.79 : x
  2. Step 2: Convert to fraction form
    710.20/1,064.40 = 319.79/x
  3. Step 3: Cross multiply
    710.20x = 1,064.40 × 319.79
  4. Step 4: Simplify right side
    710.20x = 340,384.48
  5. Step 5: Solve for x
    x = 340,384.48/710.20
  6. Step 6: Final answer
    x = 479.28

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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.