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Finding the Fourth Proportional to 939.24, 1,407.96 and 859.06

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Solution

The fourth proportional to 939.24, 1,407.96 and 859.06 is: 1,287.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.24 : 1,407.96 = 859.06 : x
  2. Step 2: Convert to fraction form
    939.24/1,407.96 = 859.06/x
  3. Step 3: Cross multiply
    939.24x = 1,407.96 × 859.06
  4. Step 4: Simplify right side
    939.24x = 1,209,522.12
  5. Step 5: Solve for x
    x = 1,209,522.12/939.24
  6. Step 6: Final answer
    x = 1,287.77

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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.