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Finding the Fourth Proportional to 745.08, 1,117.24 and 312.12

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Solution

The fourth proportional to 745.08, 1,117.24 and 312.12 is: 468.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.08 : 1,117.24 = 312.12 : x
  2. Step 2: Convert to fraction form
    745.08/1,117.24 = 312.12/x
  3. Step 3: Cross multiply
    745.08x = 1,117.24 × 312.12
  4. Step 4: Simplify right side
    745.08x = 348,712.95
  5. Step 5: Solve for x
    x = 348,712.95/745.08
  6. Step 6: Final answer
    x = 468.02

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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.