Home / 689,971.20-952,120.32-388,147.20

Finding the Fourth Proportional to 689,971.20, 952,120.32 and 388,147.20

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Solution

The fourth proportional to 689,971.20, 952,120.32 and 388,147.20 is: 535,620.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,971.20 : 952,120.32 = 388,147.20 : x
  2. Step 2: Convert to fraction form
    689,971.20/952,120.32 = 388,147.20/x
  3. Step 3: Cross multiply
    689,971.20x = 952,120.32 × 388,147.20
  4. Step 4: Simplify right side
    689,971.20x = 369,562,836,271.10
  5. Step 5: Solve for x
    x = 369,562,836,271.10/689,971.20
  6. Step 6: Final answer
    x = 535,620.67

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Double scale
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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.