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Finding the Fourth Proportional to 398,427.18, 549,300.60 and 321,860.04

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Solution

The fourth proportional to 398,427.18, 549,300.60 and 321,860.04 is: 443,739.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,427.18 : 549,300.60 = 321,860.04 : x
  2. Step 2: Convert to fraction form
    398,427.18/549,300.60 = 321,860.04/x
  3. Step 3: Cross multiply
    398,427.18x = 549,300.60 × 321,860.04
  4. Step 4: Simplify right side
    398,427.18x = 176,797,913,088.02
  5. Step 5: Solve for x
    x = 176,797,913,088.02/398,427.18
  6. Step 6: Final answer
    x = 443,739.59

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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.