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Finding the Fourth Proportional to 2,538.16, 3,807.25 and 978.87

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Solution

The fourth proportional to 2,538.16, 3,807.25 and 978.87 is: 1,468.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,538.16 : 3,807.25 = 978.87 : x
  2. Step 2: Convert to fraction form
    2,538.16/3,807.25 = 978.87/x
  3. Step 3: Cross multiply
    2,538.16x = 3,807.25 × 978.87
  4. Step 4: Simplify right side
    2,538.16x = 3,726,802.81
  5. Step 5: Solve for x
    x = 3,726,802.81/2,538.16
  6. Step 6: Final answer
    x = 1,468.31

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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.