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Finding the Fourth Proportional to 643,803.30, 888,431.22 and 353,415.06

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Solution

The fourth proportional to 643,803.30, 888,431.22 and 353,415.06 is: 487,703.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,803.30 : 888,431.22 = 353,415.06 : x
  2. Step 2: Convert to fraction form
    643,803.30/888,431.22 = 353,415.06/x
  3. Step 3: Cross multiply
    643,803.30x = 888,431.22 × 353,415.06
  4. Step 4: Simplify right side
    643,803.30x = 313,984,972,922.17
  5. Step 5: Solve for x
    x = 313,984,972,922.17/643,803.30
  6. Step 6: Final answer
    x = 487,703.27

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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.