Home / 810,003.20-1,215,004.80-390,099.20

Finding the Fourth Proportional to 810,003.20, 1,215,004.80 and 390,099.20

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Solution

The fourth proportional to 810,003.20, 1,215,004.80 and 390,099.20 is: 585,148.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    810,003.20 : 1,215,004.80 = 390,099.20 : x
  2. Step 2: Convert to fraction form
    810,003.20/1,215,004.80 = 390,099.20/x
  3. Step 3: Cross multiply
    810,003.20x = 1,215,004.80 × 390,099.20
  4. Step 4: Simplify right side
    810,003.20x = 473,972,400,476.16
  5. Step 5: Solve for x
    x = 473,972,400,476.16/810,003.20
  6. Step 6: Final answer
    x = 585,148.80

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.