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Finding the Fourth Proportional to 128,120.78, 176,803.00 and 71,530.94

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Solution

The fourth proportional to 128,120.78, 176,803.00 and 71,530.94 is: 98,710.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,120.78 : 176,803.00 = 71,530.94 : x
  2. Step 2: Convert to fraction form
    128,120.78/176,803.00 = 71,530.94/x
  3. Step 3: Cross multiply
    128,120.78x = 176,803.00 × 71,530.94
  4. Step 4: Simplify right side
    128,120.78x = 12,646,883,721.98
  5. Step 5: Solve for x
    x = 12,646,883,721.98/128,120.78
  6. Step 6: Final answer
    x = 98,710.64

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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.