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Finding the Fourth Proportional to 1,052.15, 1,578.40 and 856.69

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Solution

The fourth proportional to 1,052.15, 1,578.40 and 856.69 is: 1,285.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,052.15 : 1,578.40 = 856.69 : x
  2. Step 2: Convert to fraction form
    1,052.15/1,578.40 = 856.69/x
  3. Step 3: Cross multiply
    1,052.15x = 1,578.40 × 856.69
  4. Step 4: Simplify right side
    1,052.15x = 1,352,196.83
  5. Step 5: Solve for x
    x = 1,352,196.83/1,052.15
  6. Step 6: Final answer
    x = 1,285.17

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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.