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Finding the Fourth Proportional to 489,128.64, 674,711.55 and 307,553.10

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Solution

The fourth proportional to 489,128.64, 674,711.55 and 307,553.10 is: 424,243.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,128.64 : 674,711.55 = 307,553.10 : x
  2. Step 2: Convert to fraction form
    489,128.64/674,711.55 = 307,553.10/x
  3. Step 3: Cross multiply
    489,128.64x = 674,711.55 × 307,553.10
  4. Step 4: Simplify right side
    489,128.64x = 207,509,628,808.31
  5. Step 5: Solve for x
    x = 207,509,628,808.31/489,128.64
  6. Step 6: Final answer
    x = 424,243.46

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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.