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Finding the Fourth Proportional to 621,435.95, 857,699.38 and 388,970.71

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Solution

The fourth proportional to 621,435.95, 857,699.38 and 388,970.71 is: 536,853.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,435.95 : 857,699.38 = 388,970.71 : x
  2. Step 2: Convert to fraction form
    621,435.95/857,699.38 = 388,970.71/x
  3. Step 3: Cross multiply
    621,435.95x = 857,699.38 × 388,970.71
  4. Step 4: Simplify right side
    621,435.95x = 333,619,935,147.13
  5. Step 5: Solve for x
    x = 333,619,935,147.13/621,435.95
  6. Step 6: Final answer
    x = 536,853.29

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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.