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Finding the Fourth Proportional to 78,090.90, 117,135.32 and 18,927.08

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Solution

The fourth proportional to 78,090.90, 117,135.32 and 18,927.08 is: 28,390.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,090.90 : 117,135.32 = 18,927.08 : x
  2. Step 2: Convert to fraction form
    78,090.90/117,135.32 = 18,927.08/x
  3. Step 3: Cross multiply
    78,090.90x = 117,135.32 × 18,927.08
  4. Step 4: Simplify right side
    78,090.90x = 2,217,029,990.30
  5. Step 5: Solve for x
    x = 2,217,029,990.30/78,090.90
  6. Step 6: Final answer
    x = 28,390.38

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1.5x scale

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.