Home / 129,709.89-178,999.94-72,347.78

Finding the Fourth Proportional to 129,709.89, 178,999.94 and 72,347.78

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Solution

The fourth proportional to 129,709.89, 178,999.94 and 72,347.78 is: 99,840.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,709.89 : 178,999.94 = 72,347.78 : x
  2. Step 2: Convert to fraction form
    129,709.89/178,999.94 = 72,347.78/x
  3. Step 3: Cross multiply
    129,709.89x = 178,999.94 × 72,347.78
  4. Step 4: Simplify right side
    129,709.89x = 12,950,248,907.50
  5. Step 5: Solve for x
    x = 12,950,248,907.50/129,709.89
  6. Step 6: Final answer
    x = 99,840.10

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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.