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Finding the Fourth Proportional to 1,270.48, 1,904.42 and 859.66

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Solution

The fourth proportional to 1,270.48, 1,904.42 and 859.66 is: 1,288.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.48 : 1,904.42 = 859.66 : x
  2. Step 2: Convert to fraction form
    1,270.48/1,904.42 = 859.66/x
  3. Step 3: Cross multiply
    1,270.48x = 1,904.42 × 859.66
  4. Step 4: Simplify right side
    1,270.48x = 1,637,155.85
  5. Step 5: Solve for x
    x = 1,637,155.85/1,270.48
  6. Step 6: Final answer
    x = 1,288.61

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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.