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Finding the Fourth Proportional to 21,838.50, 32,762.70 and 7,987.50

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Solution

The fourth proportional to 21,838.50, 32,762.70 and 7,987.50 is: 11,983.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,838.50 : 32,762.70 = 7,987.50 : x
  2. Step 2: Convert to fraction form
    21,838.50/32,762.70 = 7,987.50/x
  3. Step 3: Cross multiply
    21,838.50x = 32,762.70 × 7,987.50
  4. Step 4: Simplify right side
    21,838.50x = 261,692,066.25
  5. Step 5: Solve for x
    x = 261,692,066.25/21,838.50
  6. Step 6: Final answer
    x = 11,983.06

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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.