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Finding the Fourth Proportional to 1,377.81, 1,901.34 and 788.13

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Solution

The fourth proportional to 1,377.81, 1,901.34 and 788.13 is: 1,087.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.81 : 1,901.34 = 788.13 : x
  2. Step 2: Convert to fraction form
    1,377.81/1,901.34 = 788.13/x
  3. Step 3: Cross multiply
    1,377.81x = 1,901.34 × 788.13
  4. Step 4: Simplify right side
    1,377.81x = 1,498,503.09
  5. Step 5: Solve for x
    x = 1,498,503.09/1,377.81
  6. Step 6: Final answer
    x = 1,087.60

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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.