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Finding the Fourth Proportional to 1,137.40, 1,570.62 and 764.26

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Solution

The fourth proportional to 1,137.40, 1,570.62 and 764.26 is: 1,055.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.40 : 1,570.62 = 764.26 : x
  2. Step 2: Convert to fraction form
    1,137.40/1,570.62 = 764.26/x
  3. Step 3: Cross multiply
    1,137.40x = 1,570.62 × 764.26
  4. Step 4: Simplify right side
    1,137.40x = 1,200,362.04
  5. Step 5: Solve for x
    x = 1,200,362.04/1,137.40
  6. Step 6: Final answer
    x = 1,055.36

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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.