Home / 810,007.20-1,215,010.80-390,103.20

Finding the Fourth Proportional to 810,007.20, 1,215,010.80 and 390,103.20

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Solution

The fourth proportional to 810,007.20, 1,215,010.80 and 390,103.20 is: 585,154.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    810,007.20 : 1,215,010.80 = 390,103.20 : x
  2. Step 2: Convert to fraction form
    810,007.20/1,215,010.80 = 390,103.20/x
  3. Step 3: Cross multiply
    810,007.20x = 1,215,010.80 × 390,103.20
  4. Step 4: Simplify right side
    810,007.20x = 473,979,601,114.56
  5. Step 5: Solve for x
    x = 473,979,601,114.56/810,007.20
  6. Step 6: Final answer
    x = 585,154.80

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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.