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Finding the Fourth Proportional to 867,999.40, 1,212,399.80 and 867,999.40

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Solution

The fourth proportional to 867,999.40, 1,212,399.80 and 867,999.40 is: 1,212,399.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    867,999.40 : 1,212,399.80 = 867,999.40 : x
  2. Step 2: Convert to fraction form
    867,999.40/1,212,399.80 = 867,999.40/x
  3. Step 3: Cross multiply
    867,999.40x = 1,212,399.80 × 867,999.40
  4. Step 4: Simplify right side
    867,999.40x = 1,052,362,298,960.12
  5. Step 5: Solve for x
    x = 1,052,362,298,960.12/867,999.40
  6. Step 6: Final answer
    x = 1,212,399.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.