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Finding the Fourth Proportional to 636,691.12, 879,893.89 and 521,788.57

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Solution

The fourth proportional to 636,691.12, 879,893.89 and 521,788.57 is: 721,100.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,691.12 : 879,893.89 = 521,788.57 : x
  2. Step 2: Convert to fraction form
    636,691.12/879,893.89 = 521,788.57/x
  3. Step 3: Cross multiply
    636,691.12x = 879,893.89 × 521,788.57
  4. Step 4: Simplify right side
    636,691.12x = 459,118,571,110.63
  5. Step 5: Solve for x
    x = 459,118,571,110.63/636,691.12
  6. Step 6: Final answer
    x = 721,100.95

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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.