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Finding the Fourth Proportional to 210,502.16, 315,540.48 and 90,637.28

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Solution

The fourth proportional to 210,502.16, 315,540.48 and 90,637.28 is: 135,864.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,502.16 : 315,540.48 = 90,637.28 : x
  2. Step 2: Convert to fraction form
    210,502.16/315,540.48 = 90,637.28/x
  3. Step 3: Cross multiply
    210,502.16x = 315,540.48 × 90,637.28
  4. Step 4: Simplify right side
    210,502.16x = 28,599,730,837.09
  5. Step 5: Solve for x
    x = 28,599,730,837.09/210,502.16
  6. Step 6: Final answer
    x = 135,864.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.