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Finding the Fourth Proportional to 210,163.60, 290,068.92 and 128,505.82

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Solution

The fourth proportional to 210,163.60, 290,068.92 and 128,505.82 is: 177,364.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,163.60 : 290,068.92 = 128,505.82 : x
  2. Step 2: Convert to fraction form
    210,163.60/290,068.92 = 128,505.82/x
  3. Step 3: Cross multiply
    210,163.60x = 290,068.92 × 128,505.82
  4. Step 4: Simplify right side
    210,163.60x = 37,275,544,421.11
  5. Step 5: Solve for x
    x = 37,275,544,421.11/210,163.60
  6. Step 6: Final answer
    x = 177,364.42

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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.