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Finding the Fourth Proportional to 1,130.08, 1,559.54 and 687.97

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Solution

The fourth proportional to 1,130.08, 1,559.54 and 687.97 is: 949.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.08 : 1,559.54 = 687.97 : x
  2. Step 2: Convert to fraction form
    1,130.08/1,559.54 = 687.97/x
  3. Step 3: Cross multiply
    1,130.08x = 1,559.54 × 687.97
  4. Step 4: Simplify right side
    1,130.08x = 1,072,905.50
  5. Step 5: Solve for x
    x = 1,072,905.50/1,130.08
  6. Step 6: Final answer
    x = 949.41

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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.