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Finding the Fourth Proportional to 78,699.95, 108,602.78 and 42,889.20

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Solution

The fourth proportional to 78,699.95, 108,602.78 and 42,889.20 is: 59,185.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,699.95 : 108,602.78 = 42,889.20 : x
  2. Step 2: Convert to fraction form
    78,699.95/108,602.78 = 42,889.20/x
  3. Step 3: Cross multiply
    78,699.95x = 108,602.78 × 42,889.20
  4. Step 4: Simplify right side
    78,699.95x = 4,657,885,730.27
  5. Step 5: Solve for x
    x = 4,657,885,730.27/78,699.95
  6. Step 6: Final answer
    x = 59,185.37

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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.