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Finding the Fourth Proportional to 1,393.39, 1,920.67 and 1,113.13

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Solution

The fourth proportional to 1,393.39, 1,920.67 and 1,113.13 is: 1,534.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.39 : 1,920.67 = 1,113.13 : x
  2. Step 2: Convert to fraction form
    1,393.39/1,920.67 = 1,113.13/x
  3. Step 3: Cross multiply
    1,393.39x = 1,920.67 × 1,113.13
  4. Step 4: Simplify right side
    1,393.39x = 2,137,955.40
  5. Step 5: Solve for x
    x = 2,137,955.40/1,393.39
  6. Step 6: Final answer
    x = 1,534.36

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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.