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Finding the Fourth Proportional to 1,955.70, 2,931.81 and 859.23

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Solution

The fourth proportional to 1,955.70, 2,931.81 and 859.23 is: 1,288.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,955.70 : 2,931.81 = 859.23 : x
  2. Step 2: Convert to fraction form
    1,955.70/2,931.81 = 859.23/x
  3. Step 3: Cross multiply
    1,955.70x = 2,931.81 × 859.23
  4. Step 4: Simplify right side
    1,955.70x = 2,519,099.11
  5. Step 5: Solve for x
    x = 2,519,099.11/1,955.70
  6. Step 6: Final answer
    x = 1,288.08

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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.