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Finding the Fourth Proportional to 128,343.61, 177,043.09 and 74,622.69

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Solution

The fourth proportional to 128,343.61, 177,043.09 and 74,622.69 is: 102,937.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,343.61 : 177,043.09 = 74,622.69 : x
  2. Step 2: Convert to fraction form
    128,343.61/177,043.09 = 74,622.69/x
  3. Step 3: Cross multiply
    128,343.61x = 177,043.09 × 74,622.69
  4. Step 4: Simplify right side
    128,343.61x = 13,211,431,621.71
  5. Step 5: Solve for x
    x = 13,211,431,621.71/128,343.61
  6. Step 6: Final answer
    x = 102,937.98

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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.