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Finding the Fourth Proportional to 930.06, 1,389.20 and 784.26

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Solution

The fourth proportional to 930.06, 1,389.20 and 784.26 is: 1,171.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.06 : 1,389.20 = 784.26 : x
  2. Step 2: Convert to fraction form
    930.06/1,389.20 = 784.26/x
  3. Step 3: Cross multiply
    930.06x = 1,389.20 × 784.26
  4. Step 4: Simplify right side
    930.06x = 1,089,490.07
  5. Step 5: Solve for x
    x = 1,089,490.07/930.06
  6. Step 6: Final answer
    x = 1,171.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.