Home / 643,890.69-888,389.08-402,418.56

Finding the Fourth Proportional to 643,890.69, 888,389.08 and 402,418.56

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Solution

The fourth proportional to 643,890.69, 888,389.08 and 402,418.56 is: 555,225.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,890.69 : 888,389.08 = 402,418.56 : x
  2. Step 2: Convert to fraction form
    643,890.69/888,389.08 = 402,418.56/x
  3. Step 3: Cross multiply
    643,890.69x = 888,389.08 × 402,418.56
  4. Step 4: Simplify right side
    643,890.69x = 357,504,254,293.33
  5. Step 5: Solve for x
    x = 357,504,254,293.33/643,890.69
  6. Step 6: Final answer
    x = 555,225.07

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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.