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Finding the Fourth Proportional to 40,915.70, 61,412.70 and 21,208.40

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Solution

The fourth proportional to 40,915.70, 61,412.70 and 21,208.40 is: 31,832.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,915.70 : 61,412.70 = 21,208.40 : x
  2. Step 2: Convert to fraction form
    40,915.70/61,412.70 = 21,208.40/x
  3. Step 3: Cross multiply
    40,915.70x = 61,412.70 × 21,208.40
  4. Step 4: Simplify right side
    40,915.70x = 1,302,465,106.68
  5. Step 5: Solve for x
    x = 1,302,465,106.68/40,915.70
  6. Step 6: Final answer
    x = 31,832.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.