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Finding the Fourth Proportional to 1,130.40, 1,559.52 and 687.96

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Solution

The fourth proportional to 1,130.40, 1,559.52 and 687.96 is: 949.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.40 : 1,559.52 = 687.96 : x
  2. Step 2: Convert to fraction form
    1,130.40/1,559.52 = 687.96/x
  3. Step 3: Cross multiply
    1,130.40x = 1,559.52 × 687.96
  4. Step 4: Simplify right side
    1,130.40x = 1,072,887.38
  5. Step 5: Solve for x
    x = 1,072,887.38/1,130.40
  6. Step 6: Final answer
    x = 949.12

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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.