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Finding the Fourth Proportional to 489,420.96, 675,690.48 and 308,288.16

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Solution

The fourth proportional to 489,420.96, 675,690.48 and 308,288.16 is: 425,620.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,420.96 : 675,690.48 = 308,288.16 : x
  2. Step 2: Convert to fraction form
    489,420.96/675,690.48 = 308,288.16/x
  3. Step 3: Cross multiply
    489,420.96x = 675,690.48 × 308,288.16
  4. Step 4: Simplify right side
    489,420.96x = 208,307,374,808.72
  5. Step 5: Solve for x
    x = 208,307,374,808.72/489,420.96
  6. Step 6: Final answer
    x = 425,620.05

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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.