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Finding the Fourth Proportional to 828,790.80, 1,243,477.80 and 407,785.20

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Solution

The fourth proportional to 828,790.80, 1,243,477.80 and 407,785.20 is: 611,821.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    828,790.80 : 1,243,477.80 = 407,785.20 : x
  2. Step 2: Convert to fraction form
    828,790.80/1,243,477.80 = 407,785.20/x
  3. Step 3: Cross multiply
    828,790.80x = 1,243,477.80 × 407,785.20
  4. Step 4: Simplify right side
    828,790.80x = 507,071,843,368.56
  5. Step 5: Solve for x
    x = 507,071,843,368.56/828,790.80
  6. Step 6: Final answer
    x = 611,821.27

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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.