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Finding the Fourth Proportional to 1,391.36, 2,087.88 and 807.50

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Solution

The fourth proportional to 1,391.36, 2,087.88 and 807.50 is: 1,211.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.36 : 2,087.88 = 807.50 : x
  2. Step 2: Convert to fraction form
    1,391.36/2,087.88 = 807.50/x
  3. Step 3: Cross multiply
    1,391.36x = 2,087.88 × 807.50
  4. Step 4: Simplify right side
    1,391.36x = 1,685,952.66
  5. Step 5: Solve for x
    x = 1,685,952.66/1,391.36
  6. Step 6: Final answer
    x = 1,211.73

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1.5x scale

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.