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Finding the Fourth Proportional to 129,699.88, 178,985.94 and 70,083.88

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Solution

The fourth proportional to 129,699.88, 178,985.94 and 70,083.88 is: 96,715.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,699.88 : 178,985.94 = 70,083.88 : x
  2. Step 2: Convert to fraction form
    129,699.88/178,985.94 = 70,083.88/x
  3. Step 3: Cross multiply
    129,699.88x = 178,985.94 × 70,083.88
  4. Step 4: Simplify right side
    129,699.88x = 12,544,029,140.65
  5. Step 5: Solve for x
    x = 12,544,029,140.65/129,699.88
  6. Step 6: Final answer
    x = 96,715.81

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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.