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Finding the Fourth Proportional to 721,335, 995,471.61 and 399,039.54

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Solution

The fourth proportional to 721,335, 995,471.61 and 399,039.54 is: 550,690.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,335 : 995,471.61 = 399,039.54 : x
  2. Step 2: Convert to fraction form
    721,335/995,471.61 = 399,039.54/x
  3. Step 3: Cross multiply
    721,335x = 995,471.61 × 399,039.54
  4. Step 4: Simplify right side
    721,335x = 397,232,533,337.46
  5. Step 5: Solve for x
    x = 397,232,533,337.46/721,335
  6. Step 6: Final answer
    x = 550,690.78

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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.