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Finding the Fourth Proportional to 745.86, 1,118.85 and 638.94

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Solution

The fourth proportional to 745.86, 1,118.85 and 638.94 is: 958.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.86 : 1,118.85 = 638.94 : x
  2. Step 2: Convert to fraction form
    745.86/1,118.85 = 638.94/x
  3. Step 3: Cross multiply
    745.86x = 1,118.85 × 638.94
  4. Step 4: Simplify right side
    745.86x = 714,878.02
  5. Step 5: Solve for x
    x = 714,878.02/745.86
  6. Step 6: Final answer
    x = 958.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.