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Finding the Fourth Proportional to 128,343.42, 177,109.47 and 71,754.66

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Solution

The fourth proportional to 128,343.42, 177,109.47 and 71,754.66 is: 99,018.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,343.42 : 177,109.47 = 71,754.66 : x
  2. Step 2: Convert to fraction form
    128,343.42/177,109.47 = 71,754.66/x
  3. Step 3: Cross multiply
    128,343.42x = 177,109.47 × 71,754.66
  4. Step 4: Simplify right side
    128,343.42x = 12,708,429,802.63
  5. Step 5: Solve for x
    x = 12,708,429,802.63/128,343.42
  6. Step 6: Final answer
    x = 99,018.94

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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.