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Finding the Fourth Proportional to 78,291.19, 108,038.89 and 42,480.46

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Solution

The fourth proportional to 78,291.19, 108,038.89 and 42,480.46 is: 58,621.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,291.19 : 108,038.89 = 42,480.46 : x
  2. Step 2: Convert to fraction form
    78,291.19/108,038.89 = 42,480.46/x
  3. Step 3: Cross multiply
    78,291.19x = 108,038.89 × 42,480.46
  4. Step 4: Simplify right side
    78,291.19x = 4,589,541,745.09
  5. Step 5: Solve for x
    x = 4,589,541,745.09/78,291.19
  6. Step 6: Final answer
    x = 58,621.43

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1.5x scale

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.