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Finding the Fourth Proportional to 219,721.50, 303,248.04 and 139,156.50

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Solution

The fourth proportional to 219,721.50, 303,248.04 and 139,156.50 is: 192,056.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,721.50 : 303,248.04 = 139,156.50 : x
  2. Step 2: Convert to fraction form
    219,721.50/303,248.04 = 139,156.50/x
  3. Step 3: Cross multiply
    219,721.50x = 303,248.04 × 139,156.50
  4. Step 4: Simplify right side
    219,721.50x = 42,198,935,878.26
  5. Step 5: Solve for x
    x = 42,198,935,878.26/219,721.50
  6. Step 6: Final answer
    x = 192,056.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.