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Finding the Fourth Proportional to 1,285.17, 1,923.99 and 978.24

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Solution

The fourth proportional to 1,285.17, 1,923.99 and 978.24 is: 1,464.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.17 : 1,923.99 = 978.24 : x
  2. Step 2: Convert to fraction form
    1,285.17/1,923.99 = 978.24/x
  3. Step 3: Cross multiply
    1,285.17x = 1,923.99 × 978.24
  4. Step 4: Simplify right side
    1,285.17x = 1,882,123.98
  5. Step 5: Solve for x
    x = 1,882,123.98/1,285.17
  6. Step 6: Final answer
    x = 1,464.49

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1.5x scale

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.