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Finding the Fourth Proportional to 661,643.40, 989,840.70 and 573,871.80

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Solution

The fourth proportional to 661,643.40, 989,840.70 and 573,871.80 is: 858,531.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,643.40 : 989,840.70 = 573,871.80 : x
  2. Step 2: Convert to fraction form
    661,643.40/989,840.70 = 573,871.80/x
  3. Step 3: Cross multiply
    661,643.40x = 989,840.70 × 573,871.80
  4. Step 4: Simplify right side
    661,643.40x = 568,041,664,222.26
  5. Step 5: Solve for x
    x = 568,041,664,222.26/661,643.40
  6. Step 6: Final answer
    x = 858,531.44

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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.