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Finding the Fourth Proportional to 1,586.51, 2,189.36 and 878.40

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Solution

The fourth proportional to 1,586.51, 2,189.36 and 878.40 is: 1,212.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,586.51 : 2,189.36 = 878.40 : x
  2. Step 2: Convert to fraction form
    1,586.51/2,189.36 = 878.40/x
  3. Step 3: Cross multiply
    1,586.51x = 2,189.36 × 878.40
  4. Step 4: Simplify right side
    1,586.51x = 1,923,133.82
  5. Step 5: Solve for x
    x = 1,923,133.82/1,586.51
  6. Step 6: Final answer
    x = 1,212.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.