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Finding the Fourth Proportional to 867,122.64, 1,299,000.80 and 639,004.32

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Solution

The fourth proportional to 867,122.64, 1,299,000.80 and 639,004.32 is: 957,266.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    867,122.64 : 1,299,000.80 = 639,004.32 : x
  2. Step 2: Convert to fraction form
    867,122.64/1,299,000.80 = 639,004.32/x
  3. Step 3: Cross multiply
    867,122.64x = 1,299,000.80 × 639,004.32
  4. Step 4: Simplify right side
    867,122.64x = 830,067,122,883.46
  5. Step 5: Solve for x
    x = 830,067,122,883.46/867,122.64
  6. Step 6: Final answer
    x = 957,266.12

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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.