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Finding the Fourth Proportional to 210,698.55, 290,843.06 and 138,106.12

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Solution

The fourth proportional to 210,698.55, 290,843.06 and 138,106.12 is: 190,638.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,698.55 : 290,843.06 = 138,106.12 : x
  2. Step 2: Convert to fraction form
    210,698.55/290,843.06 = 138,106.12/x
  3. Step 3: Cross multiply
    210,698.55x = 290,843.06 × 138,106.12
  4. Step 4: Simplify right side
    210,698.55x = 40,167,206,545.53
  5. Step 5: Solve for x
    x = 40,167,206,545.53/210,698.55
  6. Step 6: Final answer
    x = 190,638.27

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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.