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Finding the Fourth Proportional to 745.17, 1,027.80 and 492.81

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Solution

The fourth proportional to 745.17, 1,027.80 and 492.81 is: 679.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.17 : 1,027.80 = 492.81 : x
  2. Step 2: Convert to fraction form
    745.17/1,027.80 = 492.81/x
  3. Step 3: Cross multiply
    745.17x = 1,027.80 × 492.81
  4. Step 4: Simplify right side
    745.17x = 506,510.12
  5. Step 5: Solve for x
    x = 506,510.12/745.17
  6. Step 6: Final answer
    x = 679.72

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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.