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Finding the Fourth Proportional to 745.70, 1,029.21 and 695.30

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Solution

The fourth proportional to 745.70, 1,029.21 and 695.30 is: 959.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.70 : 1,029.21 = 695.30 : x
  2. Step 2: Convert to fraction form
    745.70/1,029.21 = 695.30/x
  3. Step 3: Cross multiply
    745.70x = 1,029.21 × 695.30
  4. Step 4: Simplify right side
    745.70x = 715,609.71
  5. Step 5: Solve for x
    x = 715,609.71/745.70
  6. Step 6: Final answer
    x = 959.65

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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.