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Finding the Fourth Proportional to 78,669.18, 108,563.14 and 42,859.08

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Solution

The fourth proportional to 78,669.18, 108,563.14 and 42,859.08 is: 59,145.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,669.18 : 108,563.14 = 42,859.08 : x
  2. Step 2: Convert to fraction form
    78,669.18/108,563.14 = 42,859.08/x
  3. Step 3: Cross multiply
    78,669.18x = 108,563.14 × 42,859.08
  4. Step 4: Simplify right side
    78,669.18x = 4,652,915,652.35
  5. Step 5: Solve for x
    x = 4,652,915,652.35/78,669.18
  6. Step 6: Final answer
    x = 59,145.35

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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.