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Finding the Fourth Proportional to 1,312.88, 1,808.06 and 919.22

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Solution

The fourth proportional to 1,312.88, 1,808.06 and 919.22 is: 1,265.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.88 : 1,808.06 = 919.22 : x
  2. Step 2: Convert to fraction form
    1,312.88/1,808.06 = 919.22/x
  3. Step 3: Cross multiply
    1,312.88x = 1,808.06 × 919.22
  4. Step 4: Simplify right side
    1,312.88x = 1,661,991.28
  5. Step 5: Solve for x
    x = 1,661,991.28/1,312.88
  6. Step 6: Final answer
    x = 1,265.92

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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.