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Finding the Fourth Proportional to 388,616.13, 583,007.55 and 220,217.13

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Solution

The fourth proportional to 388,616.13, 583,007.55 and 220,217.13 is: 330,372.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,616.13 : 583,007.55 = 220,217.13 : x
  2. Step 2: Convert to fraction form
    388,616.13/583,007.55 = 220,217.13/x
  3. Step 3: Cross multiply
    388,616.13x = 583,007.55 × 220,217.13
  4. Step 4: Simplify right side
    388,616.13x = 128,388,249,429.33
  5. Step 5: Solve for x
    x = 128,388,249,429.33/388,616.13
  6. Step 6: Final answer
    x = 330,372.93

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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.