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Finding the Fourth Proportional to 388,164.15, 535,660.75 and 216,081.80

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Solution

The fourth proportional to 388,164.15, 535,660.75 and 216,081.80 is: 298,189.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,164.15 : 535,660.75 = 216,081.80 : x
  2. Step 2: Convert to fraction form
    388,164.15/535,660.75 = 216,081.80/x
  3. Step 3: Cross multiply
    388,164.15x = 535,660.75 × 216,081.80
  4. Step 4: Simplify right side
    388,164.15x = 115,746,542,068.12
  5. Step 5: Solve for x
    x = 115,746,542,068.12/388,164.15
  6. Step 6: Final answer
    x = 298,189.67

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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.