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Finding the Fourth Proportional to 1,010.95, 1,518.23 and 978.55

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Solution

The fourth proportional to 1,010.95, 1,518.23 and 978.55 is: 1,469.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.95 : 1,518.23 = 978.55 : x
  2. Step 2: Convert to fraction form
    1,010.95/1,518.23 = 978.55/x
  3. Step 3: Cross multiply
    1,010.95x = 1,518.23 × 978.55
  4. Step 4: Simplify right side
    1,010.95x = 1,485,659.07
  5. Step 5: Solve for x
    x = 1,485,659.07/1,010.95
  6. Step 6: Final answer
    x = 1,469.57

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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.