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Finding the Fourth Proportional to 718,422.85, 991,430.46 and 396,144.37

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Solution

The fourth proportional to 718,422.85, 991,430.46 and 396,144.37 is: 546,683.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,422.85 : 991,430.46 = 396,144.37 : x
  2. Step 2: Convert to fraction form
    718,422.85/991,430.46 = 396,144.37/x
  3. Step 3: Cross multiply
    718,422.85x = 991,430.46 × 396,144.37
  4. Step 4: Simplify right side
    718,422.85x = 392,749,594,975.51
  5. Step 5: Solve for x
    x = 392,749,594,975.51/718,422.85
  6. Step 6: Final answer
    x = 546,683.05

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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.