Home / 128,985.23-178,000.40-71,625.49

Finding the Fourth Proportional to 128,985.23, 178,000.40 and 71,625.49

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Solution

The fourth proportional to 128,985.23, 178,000.40 and 71,625.49 is: 98,843.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,985.23 : 178,000.40 = 71,625.49 : x
  2. Step 2: Convert to fraction form
    128,985.23/178,000.40 = 71,625.49/x
  3. Step 3: Cross multiply
    128,985.23x = 178,000.40 × 71,625.49
  4. Step 4: Simplify right side
    128,985.23x = 12,749,365,604.26
  5. Step 5: Solve for x
    x = 12,749,365,604.26/128,985.23
  6. Step 6: Final answer
    x = 98,843.61

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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.