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Finding the Fourth Proportional to 1,415.96, 2,120.28 and 978.56

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Solution

The fourth proportional to 1,415.96, 2,120.28 and 978.56 is: 1,465.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.96 : 2,120.28 = 978.56 : x
  2. Step 2: Convert to fraction form
    1,415.96/2,120.28 = 978.56/x
  3. Step 3: Cross multiply
    1,415.96x = 2,120.28 × 978.56
  4. Step 4: Simplify right side
    1,415.96x = 2,074,821.20
  5. Step 5: Solve for x
    x = 2,074,821.20/1,415.96
  6. Step 6: Final answer
    x = 1,465.31

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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.