Home / 685,899.40-947,003.10-428,168.74

Finding the Fourth Proportional to 685,899.40, 947,003.10 and 428,168.74

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Solution

The fourth proportional to 685,899.40, 947,003.10 and 428,168.74 is: 591,161.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,899.40 : 947,003.10 = 428,168.74 : x
  2. Step 2: Convert to fraction form
    685,899.40/947,003.10 = 428,168.74/x
  3. Step 3: Cross multiply
    685,899.40x = 947,003.10 × 428,168.74
  4. Step 4: Simplify right side
    685,899.40x = 405,477,124,103.09
  5. Step 5: Solve for x
    x = 405,477,124,103.09/685,899.40
  6. Step 6: Final answer
    x = 591,161.22

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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.