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Finding the Fourth Proportional to 806,812.80, 1,210,219.20 and 719,721.60

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Solution

The fourth proportional to 806,812.80, 1,210,219.20 and 719,721.60 is: 1,079,582.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    806,812.80 : 1,210,219.20 = 719,721.60 : x
  2. Step 2: Convert to fraction form
    806,812.80/1,210,219.20 = 719,721.60/x
  3. Step 3: Cross multiply
    806,812.80x = 1,210,219.20 × 719,721.60
  4. Step 4: Simplify right side
    806,812.80x = 871,020,898,974.72
  5. Step 5: Solve for x
    x = 871,020,898,974.72/806,812.80
  6. Step 6: Final answer
    x = 1,079,582.40

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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.