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Finding the Fourth Proportional to 318,390.94, 439,339.47 and 215,249.42

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Solution

The fourth proportional to 318,390.94, 439,339.47 and 215,249.42 is: 297,017.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,390.94 : 439,339.47 = 215,249.42 : x
  2. Step 2: Convert to fraction form
    318,390.94/439,339.47 = 215,249.42/x
  3. Step 3: Cross multiply
    318,390.94x = 439,339.47 × 215,249.42
  4. Step 4: Simplify right side
    318,390.94x = 94,567,566,100.61
  5. Step 5: Solve for x
    x = 94,567,566,100.61/318,390.94
  6. Step 6: Final answer
    x = 297,017.14

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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.