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Finding the Fourth Proportional to 718,291.76, 991,257.63 and 396,015.44

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Solution

The fourth proportional to 718,291.76, 991,257.63 and 396,015.44 is: 546,509.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,291.76 : 991,257.63 = 396,015.44 : x
  2. Step 2: Convert to fraction form
    718,291.76/991,257.63 = 396,015.44/x
  3. Step 3: Cross multiply
    718,291.76x = 991,257.63 × 396,015.44
  4. Step 4: Simplify right side
    718,291.76x = 392,553,326,497.81
  5. Step 5: Solve for x
    x = 392,553,326,497.81/718,291.76
  6. Step 6: Final answer
    x = 546,509.58

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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.