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Finding the Fourth Proportional to 1,153, 1,590 and 754.78

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Solution

The fourth proportional to 1,153, 1,590 and 754.78 is: 1,040.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153 : 1,590 = 754.78 : x
  2. Step 2: Convert to fraction form
    1,153/1,590 = 754.78/x
  3. Step 3: Cross multiply
    1,153x = 1,590 × 754.78
  4. Step 4: Simplify right side
    1,153x = 1,200,100.20
  5. Step 5: Solve for x
    x = 1,200,100.20/1,153
  6. Step 6: Final answer
    x = 1,040.85

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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.