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Finding the Fourth Proportional to 1,309.22, 1,806.81 and 916.10

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Solution

The fourth proportional to 1,309.22, 1,806.81 and 916.10 is: 1,264.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.22 : 1,806.81 = 916.10 : x
  2. Step 2: Convert to fraction form
    1,309.22/1,806.81 = 916.10/x
  3. Step 3: Cross multiply
    1,309.22x = 1,806.81 × 916.10
  4. Step 4: Simplify right side
    1,309.22x = 1,655,218.64
  5. Step 5: Solve for x
    x = 1,655,218.64/1,309.22
  6. Step 6: Final answer
    x = 1,264.28

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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.