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Finding the Fourth Proportional to 1,320.54, 1,979.02 and 858.07

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Solution

The fourth proportional to 1,320.54, 1,979.02 and 858.07 is: 1,285.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.54 : 1,979.02 = 858.07 : x
  2. Step 2: Convert to fraction form
    1,320.54/1,979.02 = 858.07/x
  3. Step 3: Cross multiply
    1,320.54x = 1,979.02 × 858.07
  4. Step 4: Simplify right side
    1,320.54x = 1,698,137.69
  5. Step 5: Solve for x
    x = 1,698,137.69/1,320.54
  6. Step 6: Final answer
    x = 1,285.94

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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.