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Finding the Fourth Proportional to 74,391, 111,592.98 and 18,987

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Solution

The fourth proportional to 74,391, 111,592.98 and 18,987 is: 28,482.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,391 : 111,592.98 = 18,987 : x
  2. Step 2: Convert to fraction form
    74,391/111,592.98 = 18,987/x
  3. Step 3: Cross multiply
    74,391x = 111,592.98 × 18,987
  4. Step 4: Simplify right side
    74,391x = 2,118,815,911.26
  5. Step 5: Solve for x
    x = 2,118,815,911.26/74,391
  6. Step 6: Final answer
    x = 28,482.15

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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.