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Finding the Fourth Proportional to 1,529.52, 2,291.08 and 978.90

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Solution

The fourth proportional to 1,529.52, 2,291.08 and 978.90 is: 1,466.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,529.52 : 2,291.08 = 978.90 : x
  2. Step 2: Convert to fraction form
    1,529.52/2,291.08 = 978.90/x
  3. Step 3: Cross multiply
    1,529.52x = 2,291.08 × 978.90
  4. Step 4: Simplify right side
    1,529.52x = 2,242,738.21
  5. Step 5: Solve for x
    x = 2,242,738.21/1,529.52
  6. Step 6: Final answer
    x = 1,466.30

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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.