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Finding the Fourth Proportional to 128,307.65, 177,049.10 and 70,939.22

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Solution

The fourth proportional to 128,307.65, 177,049.10 and 70,939.22 is: 97,887.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,307.65 : 177,049.10 = 70,939.22 : x
  2. Step 2: Convert to fraction form
    128,307.65/177,049.10 = 70,939.22/x
  3. Step 3: Cross multiply
    128,307.65x = 177,049.10 × 70,939.22
  4. Step 4: Simplify right side
    128,307.65x = 12,559,724,496.60
  5. Step 5: Solve for x
    x = 12,559,724,496.60/128,307.65
  6. Step 6: Final answer
    x = 97,887.58

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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.