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Finding the Fourth Proportional to 78,428.81, 108,232.35 and 42,619.01

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Solution

The fourth proportional to 78,428.81, 108,232.35 and 42,619.01 is: 58,814.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,428.81 : 108,232.35 = 42,619.01 : x
  2. Step 2: Convert to fraction form
    78,428.81/108,232.35 = 42,619.01/x
  3. Step 3: Cross multiply
    78,428.81x = 108,232.35 × 42,619.01
  4. Step 4: Simplify right side
    78,428.81x = 4,612,755,065.81
  5. Step 5: Solve for x
    x = 4,612,755,065.81/78,428.81
  6. Step 6: Final answer
    x = 58,814.55

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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.