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Finding the Fourth Proportional to 129,686.40, 194,222.40 and 87,907.20

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Solution

The fourth proportional to 129,686.40, 194,222.40 and 87,907.20 is: 131,652.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,686.40 : 194,222.40 = 87,907.20 : x
  2. Step 2: Convert to fraction form
    129,686.40/194,222.40 = 87,907.20/x
  3. Step 3: Cross multiply
    129,686.40x = 194,222.40 × 87,907.20
  4. Step 4: Simplify right side
    129,686.40x = 17,073,547,361.28
  5. Step 5: Solve for x
    x = 17,073,547,361.28/129,686.40
  6. Step 6: Final answer
    x = 131,652.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.