Home / 78,396.90-117,561.33-28,460.40

Finding the Fourth Proportional to 78,396.90, 117,561.33 and 28,460.40

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Solution

The fourth proportional to 78,396.90, 117,561.33 and 28,460.40 is: 42,678.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,396.90 : 117,561.33 = 28,460.40 : x
  2. Step 2: Convert to fraction form
    78,396.90/117,561.33 = 28,460.40/x
  3. Step 3: Cross multiply
    78,396.90x = 117,561.33 × 28,460.40
  4. Step 4: Simplify right side
    78,396.90x = 3,345,842,476.33
  5. Step 5: Solve for x
    x = 3,345,842,476.33/78,396.90
  6. Step 6: Final answer
    x = 42,678.25

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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.