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Finding the Fourth Proportional to 259,663.55, 390,180.30 and 139,809.11

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Solution

The fourth proportional to 259,663.55, 390,180.30 and 139,809.11 is: 210,082.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,663.55 : 390,180.30 = 139,809.11 : x
  2. Step 2: Convert to fraction form
    259,663.55/390,180.30 = 139,809.11/x
  3. Step 3: Cross multiply
    259,663.55x = 390,180.30 × 139,809.11
  4. Step 4: Simplify right side
    259,663.55x = 54,550,761,457.98
  5. Step 5: Solve for x
    x = 54,550,761,457.98/259,663.55
  6. Step 6: Final answer
    x = 210,082.48

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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.