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Finding the Fourth Proportional to 489,546.72, 675,717.12 and 319,805.28

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Solution

The fourth proportional to 489,546.72, 675,717.12 and 319,805.28 is: 441,424.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,546.72 : 675,717.12 = 319,805.28 : x
  2. Step 2: Convert to fraction form
    489,546.72/675,717.12 = 319,805.28/x
  3. Step 3: Cross multiply
    489,546.72x = 675,717.12 × 319,805.28
  4. Step 4: Simplify right side
    489,546.72x = 216,097,902,762.39
  5. Step 5: Solve for x
    x = 216,097,902,762.39/489,546.72
  6. Step 6: Final answer
    x = 441,424.47

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1.5x scale

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.