Home / 129,285.12-178,516.80-83,985.60

Finding the Fourth Proportional to 129,285.12, 178,516.80 and 83,985.60

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Solution

The fourth proportional to 129,285.12, 178,516.80 and 83,985.60 is: 115,967.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,285.12 : 178,516.80 = 83,985.60 : x
  2. Step 2: Convert to fraction form
    129,285.12/178,516.80 = 83,985.60/x
  3. Step 3: Cross multiply
    129,285.12x = 178,516.80 × 83,985.60
  4. Step 4: Simplify right side
    129,285.12x = 14,992,840,558.08
  5. Step 5: Solve for x
    x = 14,992,840,558.08/129,285.12
  6. Step 6: Final answer
    x = 115,967.26

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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.