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Finding the Fourth Proportional to 2,085.74, 3,128.70 and 624.90

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Solution

The fourth proportional to 2,085.74, 3,128.70 and 624.90 is: 937.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.74 : 3,128.70 = 624.90 : x
  2. Step 2: Convert to fraction form
    2,085.74/3,128.70 = 624.90/x
  3. Step 3: Cross multiply
    2,085.74x = 3,128.70 × 624.90
  4. Step 4: Simplify right side
    2,085.74x = 1,955,124.63
  5. Step 5: Solve for x
    x = 1,955,124.63/2,085.74
  6. Step 6: Final answer
    x = 937.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.