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Finding the Fourth Proportional to 929.36, 1,391.16 and 545.36

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Solution

The fourth proportional to 929.36, 1,391.16 and 545.36 is: 816.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.36 : 1,391.16 = 545.36 : x
  2. Step 2: Convert to fraction form
    929.36/1,391.16 = 545.36/x
  3. Step 3: Cross multiply
    929.36x = 1,391.16 × 545.36
  4. Step 4: Simplify right side
    929.36x = 758,683.02
  5. Step 5: Solve for x
    x = 758,683.02/929.36
  6. Step 6: Final answer
    x = 816.35

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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.