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Finding the Fourth Proportional to 764.45, 1,054.40 and 647.52

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Solution

The fourth proportional to 764.45, 1,054.40 and 647.52 is: 893.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.45 : 1,054.40 = 647.52 : x
  2. Step 2: Convert to fraction form
    764.45/1,054.40 = 647.52/x
  3. Step 3: Cross multiply
    764.45x = 1,054.40 × 647.52
  4. Step 4: Simplify right side
    764.45x = 682,745.09
  5. Step 5: Solve for x
    x = 682,745.09/764.45
  6. Step 6: Final answer
    x = 893.12

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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.