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Finding the Fourth Proportional to 1,377.50, 1,900.92 and 788.18

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Solution

The fourth proportional to 1,377.50, 1,900.92 and 788.18 is: 1,087.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.50 : 1,900.92 = 788.18 : x
  2. Step 2: Convert to fraction form
    1,377.50/1,900.92 = 788.18/x
  3. Step 3: Cross multiply
    1,377.50x = 1,900.92 × 788.18
  4. Step 4: Simplify right side
    1,377.50x = 1,498,267.13
  5. Step 5: Solve for x
    x = 1,498,267.13/1,377.50
  6. Step 6: Final answer
    x = 1,087.67

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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.