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Finding the Fourth Proportional to 880.36, 1,211.94 and 807.40

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Solution

The fourth proportional to 880.36, 1,211.94 and 807.40 is: 1,111.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.36 : 1,211.94 = 807.40 : x
  2. Step 2: Convert to fraction form
    880.36/1,211.94 = 807.40/x
  3. Step 3: Cross multiply
    880.36x = 1,211.94 × 807.40
  4. Step 4: Simplify right side
    880.36x = 978,520.36
  5. Step 5: Solve for x
    x = 978,520.36/880.36
  6. Step 6: Final answer
    x = 1,111.50

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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.