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Finding the Fourth Proportional to 78,661.56, 108,551.70 and 42,852

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Solution

The fourth proportional to 78,661.56, 108,551.70 and 42,852 is: 59,135.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,661.56 : 108,551.70 = 42,852 : x
  2. Step 2: Convert to fraction form
    78,661.56/108,551.70 = 42,852/x
  3. Step 3: Cross multiply
    78,661.56x = 108,551.70 × 42,852
  4. Step 4: Simplify right side
    78,661.56x = 4,651,657,448.40
  5. Step 5: Solve for x
    x = 4,651,657,448.40/78,661.56
  6. Step 6: Final answer
    x = 59,135.08

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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.