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Finding the Fourth Proportional to 870,135.40, 1,305,203.10 and 811,086.40

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Solution

The fourth proportional to 870,135.40, 1,305,203.10 and 811,086.40 is: 1,216,629.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    870,135.40 : 1,305,203.10 = 811,086.40 : x
  2. Step 2: Convert to fraction form
    870,135.40/1,305,203.10 = 811,086.40/x
  3. Step 3: Cross multiply
    870,135.40x = 1,305,203.10 × 811,086.40
  4. Step 4: Simplify right side
    870,135.40x = 1,058,632,483,647.84
  5. Step 5: Solve for x
    x = 1,058,632,483,647.84/870,135.40
  6. Step 6: Final answer
    x = 1,216,629.60

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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.