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Finding the Fourth Proportional to 128,342.61, 177,041.71 and 74,621.69

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Solution

The fourth proportional to 128,342.61, 177,041.71 and 74,621.69 is: 102,936.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,342.61 : 177,041.71 = 74,621.69 : x
  2. Step 2: Convert to fraction form
    128,342.61/177,041.71 = 74,621.69/x
  3. Step 3: Cross multiply
    128,342.61x = 177,041.71 × 74,621.69
  4. Step 4: Simplify right side
    128,342.61x = 13,211,151,384.87
  5. Step 5: Solve for x
    x = 13,211,151,384.87/128,342.61
  6. Step 6: Final answer
    x = 102,936.59

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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.