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Finding the Fourth Proportional to 1,078.94, 1,488.94 and 630.90

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Solution

The fourth proportional to 1,078.94, 1,488.94 and 630.90 is: 870.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.94 : 1,488.94 = 630.90 : x
  2. Step 2: Convert to fraction form
    1,078.94/1,488.94 = 630.90/x
  3. Step 3: Cross multiply
    1,078.94x = 1,488.94 × 630.90
  4. Step 4: Simplify right side
    1,078.94x = 939,370.67
  5. Step 5: Solve for x
    x = 939,370.67/1,078.94
  6. Step 6: Final answer
    x = 870.64

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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.