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Finding the Fourth Proportional to 1,488.40, 2,054 and 825.30

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Solution

The fourth proportional to 1,488.40, 2,054 and 825.30 is: 1,138.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,488.40 : 2,054 = 825.30 : x
  2. Step 2: Convert to fraction form
    1,488.40/2,054 = 825.30/x
  3. Step 3: Cross multiply
    1,488.40x = 2,054 × 825.30
  4. Step 4: Simplify right side
    1,488.40x = 1,695,166.20
  5. Step 5: Solve for x
    x = 1,695,166.20/1,488.40
  6. Step 6: Final answer
    x = 1,138.92

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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.