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Finding the Fourth Proportional to 338,740.72, 508,111.26 and 86,040.16

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Solution

The fourth proportional to 338,740.72, 508,111.26 and 86,040.16 is: 129,060.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,740.72 : 508,111.26 = 86,040.16 : x
  2. Step 2: Convert to fraction form
    338,740.72/508,111.26 = 86,040.16/x
  3. Step 3: Cross multiply
    338,740.72x = 508,111.26 × 86,040.16
  4. Step 4: Simplify right side
    338,740.72x = 43,717,974,108.20
  5. Step 5: Solve for x
    x = 43,717,974,108.20/338,740.72
  6. Step 6: Final answer
    x = 129,060.29

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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.