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Finding the Fourth Proportional to 1,078.19, 1,487.93 and 636.47

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Solution

The fourth proportional to 1,078.19, 1,487.93 and 636.47 is: 878.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.19 : 1,487.93 = 636.47 : x
  2. Step 2: Convert to fraction form
    1,078.19/1,487.93 = 636.47/x
  3. Step 3: Cross multiply
    1,078.19x = 1,487.93 × 636.47
  4. Step 4: Simplify right side
    1,078.19x = 947,022.81
  5. Step 5: Solve for x
    x = 947,022.81/1,078.19
  6. Step 6: Final answer
    x = 878.35

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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.