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Finding the Fourth Proportional to 129,364.88, 178,522.80 and 72,776.72

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Solution

The fourth proportional to 129,364.88, 178,522.80 and 72,776.72 is: 100,431.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,364.88 : 178,522.80 = 72,776.72 : x
  2. Step 2: Convert to fraction form
    129,364.88/178,522.80 = 72,776.72/x
  3. Step 3: Cross multiply
    129,364.88x = 178,522.80 × 72,776.72
  4. Step 4: Simplify right side
    129,364.88x = 12,992,303,829.22
  5. Step 5: Solve for x
    x = 12,992,303,829.22/129,364.88
  6. Step 6: Final answer
    x = 100,431.46

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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.