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Finding the Fourth Proportional to 210,489.82, 290,486.49 and 128,792.51

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Solution

The fourth proportional to 210,489.82, 290,486.49 and 128,792.51 is: 177,740.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,489.82 : 290,486.49 = 128,792.51 : x
  2. Step 2: Convert to fraction form
    210,489.82/290,486.49 = 128,792.51/x
  3. Step 3: Cross multiply
    210,489.82x = 290,486.49 × 128,792.51
  4. Step 4: Simplify right side
    210,489.82x = 37,412,484,572.42
  5. Step 5: Solve for x
    x = 37,412,484,572.42/210,489.82
  6. Step 6: Final answer
    x = 177,740.11

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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.