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Finding the Fourth Proportional to 319,162.40, 478,832.16 and 139,263.56

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Solution

The fourth proportional to 319,162.40, 478,832.16 and 139,263.56 is: 208,933.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,162.40 : 478,832.16 = 139,263.56 : x
  2. Step 2: Convert to fraction form
    319,162.40/478,832.16 = 139,263.56/x
  3. Step 3: Cross multiply
    319,162.40x = 478,832.16 × 139,263.56
  4. Step 4: Simplify right side
    319,162.40x = 66,683,871,244.09
  5. Step 5: Solve for x
    x = 66,683,871,244.09/319,162.40
  6. Step 6: Final answer
    x = 208,933.98

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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.