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Finding the Fourth Proportional to 657,640.80, 986,720.40 and 258,213.60

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Solution

The fourth proportional to 657,640.80, 986,720.40 and 258,213.60 is: 387,422.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,640.80 : 986,720.40 = 258,213.60 : x
  2. Step 2: Convert to fraction form
    657,640.80/986,720.40 = 258,213.60/x
  3. Step 3: Cross multiply
    657,640.80x = 986,720.40 × 258,213.60
  4. Step 4: Simplify right side
    657,640.80x = 254,784,626,677.44
  5. Step 5: Solve for x
    x = 254,784,626,677.44/657,640.80
  6. Step 6: Final answer
    x = 387,422.17

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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.