Home / 129,631.78-178,885.93-72,277.40

Finding the Fourth Proportional to 129,631.78, 178,885.93 and 72,277.40

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Solution

The fourth proportional to 129,631.78, 178,885.93 and 72,277.40 is: 99,739.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,631.78 : 178,885.93 = 72,277.40 : x
  2. Step 2: Convert to fraction form
    129,631.78/178,885.93 = 72,277.40/x
  3. Step 3: Cross multiply
    129,631.78x = 178,885.93 × 72,277.40
  4. Step 4: Simplify right side
    129,631.78x = 12,929,409,916.98
  5. Step 5: Solve for x
    x = 12,929,409,916.98/129,631.78
  6. Step 6: Final answer
    x = 99,739.51

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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.