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Finding the Fourth Proportional to 5,641.41, 7,785 and 3,123.45

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Solution

The fourth proportional to 5,641.41, 7,785 and 3,123.45 is: 4,310.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,641.41 : 7,785 = 3,123.45 : x
  2. Step 2: Convert to fraction form
    5,641.41/7,785 = 3,123.45/x
  3. Step 3: Cross multiply
    5,641.41x = 7,785 × 3,123.45
  4. Step 4: Simplify right side
    5,641.41x = 24,316,058.25
  5. Step 5: Solve for x
    x = 24,316,058.25/5,641.41
  6. Step 6: Final answer
    x = 4,310.28

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1.5x scale

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.