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Finding the Fourth Proportional to 1,420.30, 1,959.42 and 860.56

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Solution

The fourth proportional to 1,420.30, 1,959.42 and 860.56 is: 1,187.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.30 : 1,959.42 = 860.56 : x
  2. Step 2: Convert to fraction form
    1,420.30/1,959.42 = 860.56/x
  3. Step 3: Cross multiply
    1,420.30x = 1,959.42 × 860.56
  4. Step 4: Simplify right side
    1,420.30x = 1,686,197.81
  5. Step 5: Solve for x
    x = 1,686,197.81/1,420.30
  6. Step 6: Final answer
    x = 1,187.21

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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.