Home / 1,321.39-1,981.93-347.57

Finding the Fourth Proportional to 1,321.39, 1,981.93 and 347.57

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Solution

The fourth proportional to 1,321.39, 1,981.93 and 347.57 is: 521.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.39 : 1,981.93 = 347.57 : x
  2. Step 2: Convert to fraction form
    1,321.39/1,981.93 = 347.57/x
  3. Step 3: Cross multiply
    1,321.39x = 1,981.93 × 347.57
  4. Step 4: Simplify right side
    1,321.39x = 688,849.67
  5. Step 5: Solve for x
    x = 688,849.67/1,321.39
  6. Step 6: Final answer
    x = 521.31

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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.