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Finding the Fourth Proportional to 1,320.39, 1,980.65 and 346.47

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Solution

The fourth proportional to 1,320.39, 1,980.65 and 346.47 is: 519.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.39 : 1,980.65 = 346.47 : x
  2. Step 2: Convert to fraction form
    1,320.39/1,980.65 = 346.47/x
  3. Step 3: Cross multiply
    1,320.39x = 1,980.65 × 346.47
  4. Step 4: Simplify right side
    1,320.39x = 686,234.07
  5. Step 5: Solve for x
    x = 686,234.07/1,320.39
  6. Step 6: Final answer
    x = 519.72

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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.