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Finding the Fourth Proportional to 1,558.78, 2,151.12 and 860.14

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Solution

The fourth proportional to 1,558.78, 2,151.12 and 860.14 is: 1,187.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,558.78 : 2,151.12 = 860.14 : x
  2. Step 2: Convert to fraction form
    1,558.78/2,151.12 = 860.14/x
  3. Step 3: Cross multiply
    1,558.78x = 2,151.12 × 860.14
  4. Step 4: Simplify right side
    1,558.78x = 1,850,264.36
  5. Step 5: Solve for x
    x = 1,850,264.36/1,558.78
  6. Step 6: Final answer
    x = 1,187.00

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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.