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Finding the Fourth Proportional to 745.70, 1,025.41 and 647.28

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Solution

The fourth proportional to 745.70, 1,025.41 and 647.28 is: 890.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.70 : 1,025.41 = 647.28 : x
  2. Step 2: Convert to fraction form
    745.70/1,025.41 = 647.28/x
  3. Step 3: Cross multiply
    745.70x = 1,025.41 × 647.28
  4. Step 4: Simplify right side
    745.70x = 663,727.38
  5. Step 5: Solve for x
    x = 663,727.38/745.70
  6. Step 6: Final answer
    x = 890.08

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1.5x scale

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.