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Finding the Fourth Proportional to 661,640.80, 992,720.40 and 262,213.60

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Solution

The fourth proportional to 661,640.80, 992,720.40 and 262,213.60 is: 393,423.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,640.80 : 992,720.40 = 262,213.60 : x
  2. Step 2: Convert to fraction form
    661,640.80/992,720.40 = 262,213.60/x
  3. Step 3: Cross multiply
    661,640.80x = 992,720.40 × 262,213.60
  4. Step 4: Simplify right side
    661,640.80x = 260,304,789,877.44
  5. Step 5: Solve for x
    x = 260,304,789,877.44/661,640.80
  6. Step 6: Final answer
    x = 393,423.12

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1.5x scale

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.