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Finding the Fourth Proportional to 1,369.91, 1,890.36 and 810.25

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Solution

The fourth proportional to 1,369.91, 1,890.36 and 810.25 is: 1,118.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.91 : 1,890.36 = 810.25 : x
  2. Step 2: Convert to fraction form
    1,369.91/1,890.36 = 810.25/x
  3. Step 3: Cross multiply
    1,369.91x = 1,890.36 × 810.25
  4. Step 4: Simplify right side
    1,369.91x = 1,531,659.46
  5. Step 5: Solve for x
    x = 1,531,659.46/1,369.91
  6. Step 6: Final answer
    x = 1,118.07

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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.