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Finding the Fourth Proportional to 745.86, 1,118.12 and 313.32

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Solution

The fourth proportional to 745.86, 1,118.12 and 313.32 is: 469.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.86 : 1,118.12 = 313.32 : x
  2. Step 2: Convert to fraction form
    745.86/1,118.12 = 313.32/x
  3. Step 3: Cross multiply
    745.86x = 1,118.12 × 313.32
  4. Step 4: Simplify right side
    745.86x = 350,329.36
  5. Step 5: Solve for x
    x = 350,329.36/745.86
  6. Step 6: Final answer
    x = 469.70

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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.