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Finding the Fourth Proportional to 128,049.72, 176,703.98 and 70,687.80

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Solution

The fourth proportional to 128,049.72, 176,703.98 and 70,687.80 is: 97,546.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,049.72 : 176,703.98 = 70,687.80 : x
  2. Step 2: Convert to fraction form
    128,049.72/176,703.98 = 70,687.80/x
  3. Step 3: Cross multiply
    128,049.72x = 176,703.98 × 70,687.80
  4. Step 4: Simplify right side
    128,049.72x = 12,490,815,244.01
  5. Step 5: Solve for x
    x = 12,490,815,244.01/128,049.72
  6. Step 6: Final answer
    x = 97,546.60

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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.