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Finding the Fourth Proportional to 489,179.12, 674,781.16 and 307,603.60

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Solution

The fourth proportional to 489,179.12, 674,781.16 and 307,603.60 is: 424,313.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,179.12 : 674,781.16 = 307,603.60 : x
  2. Step 2: Convert to fraction form
    489,179.12/674,781.16 = 307,603.60/x
  3. Step 3: Cross multiply
    489,179.12x = 674,781.16 × 307,603.60
  4. Step 4: Simplify right side
    489,179.12x = 207,565,114,028.18
  5. Step 5: Solve for x
    x = 207,565,114,028.18/489,179.12
  6. Step 6: Final answer
    x = 424,313.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.