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Finding the Fourth Proportional to 72,955.42, 100,678.48 and 39,421.42

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Solution

The fourth proportional to 72,955.42, 100,678.48 and 39,421.42 is: 54,401.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,955.42 : 100,678.48 = 39,421.42 : x
  2. Step 2: Convert to fraction form
    72,955.42/100,678.48 = 39,421.42/x
  3. Step 3: Cross multiply
    72,955.42x = 100,678.48 × 39,421.42
  4. Step 4: Simplify right side
    72,955.42x = 3,968,888,294.79
  5. Step 5: Solve for x
    x = 3,968,888,294.79/72,955.42
  6. Step 6: Final answer
    x = 54,401.56

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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.