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Finding the Fourth Proportional to 939.99, 1,407.94 and 528.92

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Solution

The fourth proportional to 939.99, 1,407.94 and 528.92 is: 792.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.99 : 1,407.94 = 528.92 : x
  2. Step 2: Convert to fraction form
    939.99/1,407.94 = 528.92/x
  3. Step 3: Cross multiply
    939.99x = 1,407.94 × 528.92
  4. Step 4: Simplify right side
    939.99x = 744,679.26
  5. Step 5: Solve for x
    x = 744,679.26/939.99
  6. Step 6: Final answer
    x = 792.22

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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.