Home / 1,319.90-1,984.65-1,108.70

Finding the Fourth Proportional to 1,319.90, 1,984.65 and 1,108.70

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Solution

The fourth proportional to 1,319.90, 1,984.65 and 1,108.70 is: 1,667.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.90 : 1,984.65 = 1,108.70 : x
  2. Step 2: Convert to fraction form
    1,319.90/1,984.65 = 1,108.70/x
  3. Step 3: Cross multiply
    1,319.90x = 1,984.65 × 1,108.70
  4. Step 4: Simplify right side
    1,319.90x = 2,200,381.46
  5. Step 5: Solve for x
    x = 2,200,381.46/1,319.90
  6. Step 6: Final answer
    x = 1,667.08

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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.