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Finding the Fourth Proportional to 1,152.90, 1,590.98 and 681.08

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Solution

The fourth proportional to 1,152.90, 1,590.98 and 681.08 is: 939.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.90 : 1,590.98 = 681.08 : x
  2. Step 2: Convert to fraction form
    1,152.90/1,590.98 = 681.08/x
  3. Step 3: Cross multiply
    1,152.90x = 1,590.98 × 681.08
  4. Step 4: Simplify right side
    1,152.90x = 1,083,573.30
  5. Step 5: Solve for x
    x = 1,083,573.30/1,152.90
  6. Step 6: Final answer
    x = 939.87

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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.