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Finding the Fourth Proportional to 398,858.80, 549,305.40 and 390,149.68

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Solution

The fourth proportional to 398,858.80, 549,305.40 and 390,149.68 is: 537,311.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,858.80 : 549,305.40 = 390,149.68 : x
  2. Step 2: Convert to fraction form
    398,858.80/549,305.40 = 390,149.68/x
  3. Step 3: Cross multiply
    398,858.80x = 549,305.40 × 390,149.68
  4. Step 4: Simplify right side
    398,858.80x = 214,311,326,032.27
  5. Step 5: Solve for x
    x = 214,311,326,032.27/398,858.80
  6. Step 6: Final answer
    x = 537,311.26

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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.