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Finding the Fourth Proportional to 219,871.87, 303,612.55 and 138,336.07

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Solution

The fourth proportional to 219,871.87, 303,612.55 and 138,336.07 is: 191,022.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,871.87 : 303,612.55 = 138,336.07 : x
  2. Step 2: Convert to fraction form
    219,871.87/303,612.55 = 138,336.07/x
  3. Step 3: Cross multiply
    219,871.87x = 303,612.55 × 138,336.07
  4. Step 4: Simplify right side
    219,871.87x = 42,000,565,931.36
  5. Step 5: Solve for x
    x = 42,000,565,931.36/219,871.87
  6. Step 6: Final answer
    x = 191,022.92

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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.