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Finding the Fourth Proportional to 319,908.96, 480,011.81 and 139,970.67

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Solution

The fourth proportional to 319,908.96, 480,011.81 and 139,970.67 is: 210,020.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,908.96 : 480,011.81 = 139,970.67 : x
  2. Step 2: Convert to fraction form
    319,908.96/480,011.81 = 139,970.67/x
  3. Step 3: Cross multiply
    319,908.96x = 480,011.81 × 139,970.67
  4. Step 4: Simplify right side
    319,908.96x = 67,187,572,153.72
  5. Step 5: Solve for x
    x = 67,187,572,153.72/319,908.96
  6. Step 6: Final answer
    x = 210,020.91

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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.