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Finding the Fourth Proportional to 643,920.32, 888,565.58 and 357,417.84

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Solution

The fourth proportional to 643,920.32, 888,565.58 and 357,417.84 is: 493,211.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,920.32 : 888,565.58 = 357,417.84 : x
  2. Step 2: Convert to fraction form
    643,920.32/888,565.58 = 357,417.84/x
  3. Step 3: Cross multiply
    643,920.32x = 888,565.58 × 357,417.84
  4. Step 4: Simplify right side
    643,920.32x = 317,589,188,514.86
  5. Step 5: Solve for x
    x = 317,589,188,514.86/643,920.32
  6. Step 6: Final answer
    x = 493,211.94

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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.