Home / 660,743.38-911,748.50-388,751.45

Finding the Fourth Proportional to 660,743.38, 911,748.50 and 388,751.45

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Solution

The fourth proportional to 660,743.38, 911,748.50 and 388,751.45 is: 536,431.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,743.38 : 911,748.50 = 388,751.45 : x
  2. Step 2: Convert to fraction form
    660,743.38/911,748.50 = 388,751.45/x
  3. Step 3: Cross multiply
    660,743.38x = 911,748.50 × 388,751.45
  4. Step 4: Simplify right side
    660,743.38x = 354,443,551,410.33
  5. Step 5: Solve for x
    x = 354,443,551,410.33/660,743.38
  6. Step 6: Final answer
    x = 536,431.49

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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.