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Finding the Fourth Proportional to 721,376.55, 995,515.52 and 399,109.55

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Solution

The fourth proportional to 721,376.55, 995,515.52 and 399,109.55 is: 550,779.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,376.55 : 995,515.52 = 399,109.55 : x
  2. Step 2: Convert to fraction form
    721,376.55/995,515.52 = 399,109.55/x
  3. Step 3: Cross multiply
    721,376.55x = 995,515.52 × 399,109.55
  4. Step 4: Simplify right side
    721,376.55x = 397,319,744,232.09
  5. Step 5: Solve for x
    x = 397,319,744,232.09/721,376.55
  6. Step 6: Final answer
    x = 550,779.96

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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.