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Finding the Fourth Proportional to 745.65, 1,117.47 and 581.32

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Solution

The fourth proportional to 745.65, 1,117.47 and 581.32 is: 871.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.65 : 1,117.47 = 581.32 : x
  2. Step 2: Convert to fraction form
    745.65/1,117.47 = 581.32/x
  3. Step 3: Cross multiply
    745.65x = 1,117.47 × 581.32
  4. Step 4: Simplify right side
    745.65x = 649,607.66
  5. Step 5: Solve for x
    x = 649,607.66/745.65
  6. Step 6: Final answer
    x = 871.20

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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.