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Finding the Fourth Proportional to 1,320.45, 1,980.68 and 346.53

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Solution

The fourth proportional to 1,320.45, 1,980.68 and 346.53 is: 519.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.45 : 1,980.68 = 346.53 : x
  2. Step 2: Convert to fraction form
    1,320.45/1,980.68 = 346.53/x
  3. Step 3: Cross multiply
    1,320.45x = 1,980.68 × 346.53
  4. Step 4: Simplify right side
    1,320.45x = 686,363.31
  5. Step 5: Solve for x
    x = 686,363.31/1,320.45
  6. Step 6: Final answer
    x = 519.80

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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.