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Finding the Fourth Proportional to 210,889.40, 291,033.90 and 115,400.12

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Solution

The fourth proportional to 210,889.40, 291,033.90 and 115,400.12 is: 159,255.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,889.40 : 291,033.90 = 115,400.12 : x
  2. Step 2: Convert to fraction form
    210,889.40/291,033.90 = 115,400.12/x
  3. Step 3: Cross multiply
    210,889.40x = 291,033.90 × 115,400.12
  4. Step 4: Simplify right side
    210,889.40x = 33,585,346,984.07
  5. Step 5: Solve for x
    x = 33,585,346,984.07/210,889.40
  6. Step 6: Final answer
    x = 159,255.74

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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.