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Finding the Fourth Proportional to 3,990,368.80, 5,984,386.80 and 1,431,287.20

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Solution

The fourth proportional to 3,990,368.80, 5,984,386.80 and 1,431,287.20 is: 2,146,512.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990,368.80 : 5,984,386.80 = 1,431,287.20 : x
  2. Step 2: Convert to fraction form
    3,990,368.80/5,984,386.80 = 1,431,287.20/x
  3. Step 3: Cross multiply
    3,990,368.80x = 5,984,386.80 × 1,431,287.20
  4. Step 4: Simplify right side
    3,990,368.80x = 8,565,376,226,688.96
  5. Step 5: Solve for x
    x = 8,565,376,226,688.96/3,990,368.80
  6. Step 6: Final answer
    x = 2,146,512.43

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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.