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Finding the Fourth Proportional to 78,700.28, 108,603.21 and 42,889.51

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Solution

The fourth proportional to 78,700.28, 108,603.21 and 42,889.51 is: 59,185.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,700.28 : 108,603.21 = 42,889.51 : x
  2. Step 2: Convert to fraction form
    78,700.28/108,603.21 = 42,889.51/x
  3. Step 3: Cross multiply
    78,700.28x = 108,603.21 × 42,889.51
  4. Step 4: Simplify right side
    78,700.28x = 4,657,938,757.92
  5. Step 5: Solve for x
    x = 4,657,938,757.92/78,700.28
  6. Step 6: Final answer
    x = 59,185.80

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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.