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Finding the Fourth Proportional to 338,721.49, 508,082.46 and 86,020.93

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Solution

The fourth proportional to 338,721.49, 508,082.46 and 86,020.93 is: 129,031.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,721.49 : 508,082.46 = 86,020.93 : x
  2. Step 2: Convert to fraction form
    338,721.49/508,082.46 = 86,020.93/x
  3. Step 3: Cross multiply
    338,721.49x = 508,082.46 × 86,020.93
  4. Step 4: Simplify right side
    338,721.49x = 43,705,726,038.41
  5. Step 5: Solve for x
    x = 43,705,726,038.41/338,721.49
  6. Step 6: Final answer
    x = 129,031.45

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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.