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Finding the Fourth Proportional to 131,378.70, 181,302.78 and 74,790

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Solution

The fourth proportional to 131,378.70, 181,302.78 and 74,790 is: 103,210.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,378.70 : 181,302.78 = 74,790 : x
  2. Step 2: Convert to fraction form
    131,378.70/181,302.78 = 74,790/x
  3. Step 3: Cross multiply
    131,378.70x = 181,302.78 × 74,790
  4. Step 4: Simplify right side
    131,378.70x = 13,559,634,916.20
  5. Step 5: Solve for x
    x = 13,559,634,916.20/131,378.70
  6. Step 6: Final answer
    x = 103,210.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.