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Finding the Fourth Proportional to 3,978.53, 5,490.95 and 2,385.26

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Solution

The fourth proportional to 3,978.53, 5,490.95 and 2,385.26 is: 3,292.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978.53 : 5,490.95 = 2,385.26 : x
  2. Step 2: Convert to fraction form
    3,978.53/5,490.95 = 2,385.26/x
  3. Step 3: Cross multiply
    3,978.53x = 5,490.95 × 2,385.26
  4. Step 4: Simplify right side
    3,978.53x = 13,097,331.47
  5. Step 5: Solve for x
    x = 13,097,331.47/3,978.53
  6. Step 6: Final answer
    x = 3,292.00

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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.