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Finding the Fourth Proportional to 1,228.65, 1,696.30 and 913.56

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Solution

The fourth proportional to 1,228.65, 1,696.30 and 913.56 is: 1,261.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.65 : 1,696.30 = 913.56 : x
  2. Step 2: Convert to fraction form
    1,228.65/1,696.30 = 913.56/x
  3. Step 3: Cross multiply
    1,228.65x = 1,696.30 × 913.56
  4. Step 4: Simplify right side
    1,228.65x = 1,549,671.83
  5. Step 5: Solve for x
    x = 1,549,671.83/1,228.65
  6. Step 6: Final answer
    x = 1,261.28

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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.