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Finding the Fourth Proportional to 318,054.88, 438,919.14 and 172,860.67

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Solution

The fourth proportional to 318,054.88, 438,919.14 and 172,860.67 is: 238,549.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,054.88 : 438,919.14 = 172,860.67 : x
  2. Step 2: Convert to fraction form
    318,054.88/438,919.14 = 172,860.67/x
  3. Step 3: Cross multiply
    318,054.88x = 438,919.14 × 172,860.67
  4. Step 4: Simplify right side
    318,054.88x = 75,871,856,616.22
  5. Step 5: Solve for x
    x = 75,871,856,616.22/318,054.88
  6. Step 6: Final answer
    x = 238,549.58

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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.