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Finding the Fourth Proportional to 720,625.82, 994,420.40 and 398,316.69

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Solution

The fourth proportional to 720,625.82, 994,420.40 and 398,316.69 is: 549,653.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,625.82 : 994,420.40 = 398,316.69 : x
  2. Step 2: Convert to fraction form
    720,625.82/994,420.40 = 398,316.69/x
  3. Step 3: Cross multiply
    720,625.82x = 994,420.40 × 398,316.69
  4. Step 4: Simplify right side
    720,625.82x = 396,094,240,204.89
  5. Step 5: Solve for x
    x = 396,094,240,204.89/720,625.82
  6. Step 6: Final answer
    x = 549,653.14

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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.