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Finding the Fourth Proportional to 1,059.48, 1,461.84 and 686.28

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Solution

The fourth proportional to 1,059.48, 1,461.84 and 686.28 is: 946.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,059.48 : 1,461.84 = 686.28 : x
  2. Step 2: Convert to fraction form
    1,059.48/1,461.84 = 686.28/x
  3. Step 3: Cross multiply
    1,059.48x = 1,461.84 × 686.28
  4. Step 4: Simplify right side
    1,059.48x = 1,003,231.56
  5. Step 5: Solve for x
    x = 1,003,231.56/1,059.48
  6. Step 6: Final answer
    x = 946.91

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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.