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Finding the Fourth Proportional to 388,018.35, 535,454.34 and 215,933.57

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Solution

The fourth proportional to 388,018.35, 535,454.34 and 215,933.57 is: 297,982.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,018.35 : 535,454.34 = 215,933.57 : x
  2. Step 2: Convert to fraction form
    388,018.35/535,454.34 = 215,933.57/x
  3. Step 3: Cross multiply
    388,018.35x = 535,454.34 × 215,933.57
  4. Step 4: Simplify right side
    388,018.35x = 115,622,564,530.92
  5. Step 5: Solve for x
    x = 115,622,564,530.92/388,018.35
  6. Step 6: Final answer
    x = 297,982.21

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1.5x scale

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.