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Finding the Fourth Proportional to 1,320.49, 1,980.58 and 346.67

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Solution

The fourth proportional to 1,320.49, 1,980.58 and 346.67 is: 519.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.49 : 1,980.58 = 346.67 : x
  2. Step 2: Convert to fraction form
    1,320.49/1,980.58 = 346.67/x
  3. Step 3: Cross multiply
    1,320.49x = 1,980.58 × 346.67
  4. Step 4: Simplify right side
    1,320.49x = 686,607.67
  5. Step 5: Solve for x
    x = 686,607.67/1,320.49
  6. Step 6: Final answer
    x = 519.96

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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.