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Finding the Fourth Proportional to 865,999.90, 1,298,999.85 and 492,751.90

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Solution

The fourth proportional to 865,999.90, 1,298,999.85 and 492,751.90 is: 739,127.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,999.90 : 1,298,999.85 = 492,751.90 : x
  2. Step 2: Convert to fraction form
    865,999.90/1,298,999.85 = 492,751.90/x
  3. Step 3: Cross multiply
    865,999.90x = 1,298,999.85 × 492,751.90
  4. Step 4: Simplify right side
    865,999.90x = 640,084,644,187.22
  5. Step 5: Solve for x
    x = 640,084,644,187.22/865,999.90
  6. Step 6: Final answer
    x = 739,127.85

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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.