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Finding the Fourth Proportional to 749.83, 1,124.81 and 339.16

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Solution

The fourth proportional to 749.83, 1,124.81 and 339.16 is: 508.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.83 : 1,124.81 = 339.16 : x
  2. Step 2: Convert to fraction form
    749.83/1,124.81 = 339.16/x
  3. Step 3: Cross multiply
    749.83x = 1,124.81 × 339.16
  4. Step 4: Simplify right side
    749.83x = 381,483.24
  5. Step 5: Solve for x
    x = 381,483.24/749.83
  6. Step 6: Final answer
    x = 508.76

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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.