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Finding the Fourth Proportional to 105,135, 145,080.90 and 57,379.20

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Solution

The fourth proportional to 105,135, 145,080.90 and 57,379.20 is: 79,180.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,135 : 145,080.90 = 57,379.20 : x
  2. Step 2: Convert to fraction form
    105,135/145,080.90 = 57,379.20/x
  3. Step 3: Cross multiply
    105,135x = 145,080.90 × 57,379.20
  4. Step 4: Simplify right side
    105,135x = 8,324,625,977.28
  5. Step 5: Solve for x
    x = 8,324,625,977.28/105,135
  6. Step 6: Final answer
    x = 79,180.35

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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.