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Finding the Fourth Proportional to 867,976.80, 1,301,965.20 and 728,008.80

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Solution

The fourth proportional to 867,976.80, 1,301,965.20 and 728,008.80 is: 1,092,013.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    867,976.80 : 1,301,965.20 = 728,008.80 : x
  2. Step 2: Convert to fraction form
    867,976.80/1,301,965.20 = 728,008.80/x
  3. Step 3: Cross multiply
    867,976.80x = 1,301,965.20 × 728,008.80
  4. Step 4: Simplify right side
    867,976.80x = 947,842,122,893.76
  5. Step 5: Solve for x
    x = 947,842,122,893.76/867,976.80
  6. Step 6: Final answer
    x = 1,092,013.20

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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.