Home / 78,428.09-117,642.53-19,263.78

Finding the Fourth Proportional to 78,428.09, 117,642.53 and 19,263.78

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Solution

The fourth proportional to 78,428.09, 117,642.53 and 19,263.78 is: 28,895.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,428.09 : 117,642.53 = 19,263.78 : x
  2. Step 2: Convert to fraction form
    78,428.09/117,642.53 = 19,263.78/x
  3. Step 3: Cross multiply
    78,428.09x = 117,642.53 × 19,263.78
  4. Step 4: Simplify right side
    78,428.09x = 2,266,239,864.72
  5. Step 5: Solve for x
    x = 2,266,239,864.72/78,428.09
  6. Step 6: Final answer
    x = 28,895.77

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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.