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Finding the Fourth Proportional to 878,613.09, 1,212,471.63 and 491,437.55

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Solution

The fourth proportional to 878,613.09, 1,212,471.63 and 491,437.55 is: 678,175.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,613.09 : 1,212,471.63 = 491,437.55 : x
  2. Step 2: Convert to fraction form
    878,613.09/1,212,471.63 = 491,437.55/x
  3. Step 3: Cross multiply
    878,613.09x = 1,212,471.63 × 491,437.55
  4. Step 4: Simplify right side
    878,613.09x = 595,854,081,229.35
  5. Step 5: Solve for x
    x = 595,854,081,229.35/878,613.09
  6. Step 6: Final answer
    x = 678,175.74

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Double scale
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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.