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Finding the Fourth Proportional to 621,378.83, 857,427.44 and 345,671.51

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Solution

The fourth proportional to 621,378.83, 857,427.44 and 345,671.51 is: 476,984.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,378.83 : 857,427.44 = 345,671.51 : x
  2. Step 2: Convert to fraction form
    621,378.83/857,427.44 = 345,671.51/x
  3. Step 3: Cross multiply
    621,378.83x = 857,427.44 × 345,671.51
  4. Step 4: Simplify right side
    621,378.83x = 296,388,233,829.14
  5. Step 5: Solve for x
    x = 296,388,233,829.14/621,378.83
  6. Step 6: Final answer
    x = 476,984.77

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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.