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Finding the Fourth Proportional to 661,729.40, 989,969.70 and 573,957.80

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Solution

The fourth proportional to 661,729.40, 989,969.70 and 573,957.80 is: 858,660.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,729.40 : 989,969.70 = 573,957.80 : x
  2. Step 2: Convert to fraction form
    661,729.40/989,969.70 = 573,957.80/x
  3. Step 3: Cross multiply
    661,729.40x = 989,969.70 × 573,957.80
  4. Step 4: Simplify right side
    661,729.40x = 568,200,831,078.66
  5. Step 5: Solve for x
    x = 568,200,831,078.66/661,729.40
  6. Step 6: Final answer
    x = 858,660.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.