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Finding the Fourth Proportional to 745.56, 1,029.38 and 666.63

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Solution

The fourth proportional to 745.56, 1,029.38 and 666.63 is: 920.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.56 : 1,029.38 = 666.63 : x
  2. Step 2: Convert to fraction form
    745.56/1,029.38 = 666.63/x
  3. Step 3: Cross multiply
    745.56x = 1,029.38 × 666.63
  4. Step 4: Simplify right side
    745.56x = 686,212.26
  5. Step 5: Solve for x
    x = 686,212.26/745.56
  6. Step 6: Final answer
    x = 920.40

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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.