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Finding the Fourth Proportional to 1,363.40, 1,881.70 and 839.80

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Solution

The fourth proportional to 1,363.40, 1,881.70 and 839.80 is: 1,159.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,363.40 : 1,881.70 = 839.80 : x
  2. Step 2: Convert to fraction form
    1,363.40/1,881.70 = 839.80/x
  3. Step 3: Cross multiply
    1,363.40x = 1,881.70 × 839.80
  4. Step 4: Simplify right side
    1,363.40x = 1,580,251.66
  5. Step 5: Solve for x
    x = 1,580,251.66/1,363.40
  6. Step 6: Final answer
    x = 1,159.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.