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Finding the Fourth Proportional to 79,038.22, 109,072.49 and 42,739.40

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Solution

The fourth proportional to 79,038.22, 109,072.49 and 42,739.40 is: 58,980.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,038.22 : 109,072.49 = 42,739.40 : x
  2. Step 2: Convert to fraction form
    79,038.22/109,072.49 = 42,739.40/x
  3. Step 3: Cross multiply
    79,038.22x = 109,072.49 × 42,739.40
  4. Step 4: Simplify right side
    79,038.22x = 4,661,692,779.11
  5. Step 5: Solve for x
    x = 4,661,692,779.11/79,038.22
  6. Step 6: Final answer
    x = 58,980.23

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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.