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Finding the Fourth Proportional to 388,776.81, 536,509.65 and 219,065.61

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Solution

The fourth proportional to 388,776.81, 536,509.65 and 219,065.61 is: 302,309.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,776.81 : 536,509.65 = 219,065.61 : x
  2. Step 2: Convert to fraction form
    388,776.81/536,509.65 = 219,065.61/x
  3. Step 3: Cross multiply
    388,776.81x = 536,509.65 × 219,065.61
  4. Step 4: Simplify right side
    388,776.81x = 117,530,813,748.14
  5. Step 5: Solve for x
    x = 117,530,813,748.14/388,776.81
  6. Step 6: Final answer
    x = 302,309.22

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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.