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Finding the Fourth Proportional to 1,252.80, 1,878.62 and 978.20

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Solution

The fourth proportional to 1,252.80, 1,878.62 and 978.20 is: 1,466.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.80 : 1,878.62 = 978.20 : x
  2. Step 2: Convert to fraction form
    1,252.80/1,878.62 = 978.20/x
  3. Step 3: Cross multiply
    1,252.80x = 1,878.62 × 978.20
  4. Step 4: Simplify right side
    1,252.80x = 1,837,666.08
  5. Step 5: Solve for x
    x = 1,837,666.08/1,252.80
  6. Step 6: Final answer
    x = 1,466.85

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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.