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Finding the Fourth Proportional to 489,416.21, 675,683.93 and 308,283.40

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Solution

The fourth proportional to 489,416.21, 675,683.93 and 308,283.40 is: 425,613.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,416.21 : 675,683.93 = 308,283.40 : x
  2. Step 2: Convert to fraction form
    489,416.21/675,683.93 = 308,283.40/x
  3. Step 3: Cross multiply
    489,416.21x = 675,683.93 × 308,283.40
  4. Step 4: Simplify right side
    489,416.21x = 208,302,139,146.98
  5. Step 5: Solve for x
    x = 208,302,139,146.98/489,416.21
  6. Step 6: Final answer
    x = 425,613.49

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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.