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Finding the Fourth Proportional to 1,291,821.92, 1,783,592.16 and 808,582.40

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Solution

The fourth proportional to 1,291,821.92, 1,783,592.16 and 808,582.40 is: 1,116,393.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291,821.92 : 1,783,592.16 = 808,582.40 : x
  2. Step 2: Convert to fraction form
    1,291,821.92/1,783,592.16 = 808,582.40/x
  3. Step 3: Cross multiply
    1,291,821.92x = 1,783,592.16 × 808,582.40
  4. Step 4: Simplify right side
    1,291,821.92x = 1,442,181,229,353.98
  5. Step 5: Solve for x
    x = 1,442,181,229,353.98/1,291,821.92
  6. Step 6: Final answer
    x = 1,116,393.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.