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Finding the Fourth Proportional to 643,875.99, 888,589.17 and 357,400.86

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Solution

The fourth proportional to 643,875.99, 888,589.17 and 357,400.86 is: 493,235.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,875.99 : 888,589.17 = 357,400.86 : x
  2. Step 2: Convert to fraction form
    643,875.99/888,589.17 = 357,400.86/x
  3. Step 3: Cross multiply
    643,875.99x = 888,589.17 × 357,400.86
  4. Step 4: Simplify right side
    643,875.99x = 317,582,533,544.69
  5. Step 5: Solve for x
    x = 317,582,533,544.69/643,875.99
  6. Step 6: Final answer
    x = 493,235.56

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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.