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Finding the Fourth Proportional to 489,421.96, 675,691.86 and 308,289.16

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Solution

The fourth proportional to 489,421.96, 675,691.86 and 308,289.16 is: 425,621.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,421.96 : 675,691.86 = 308,289.16 : x
  2. Step 2: Convert to fraction form
    489,421.96/675,691.86 = 308,289.16/x
  3. Step 3: Cross multiply
    489,421.96x = 675,691.86 × 308,289.16
  4. Step 4: Simplify right side
    489,421.96x = 208,308,475,938.24
  5. Step 5: Solve for x
    x = 208,308,475,938.24/489,421.96
  6. Step 6: Final answer
    x = 425,621.43

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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.