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Finding the Fourth Proportional to 30,987.05, 42,762.05 and 16,839.90

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Solution

The fourth proportional to 30,987.05, 42,762.05 and 16,839.90 is: 23,239.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,987.05 : 42,762.05 = 16,839.90 : x
  2. Step 2: Convert to fraction form
    30,987.05/42,762.05 = 16,839.90/x
  3. Step 3: Cross multiply
    30,987.05x = 42,762.05 × 16,839.90
  4. Step 4: Simplify right side
    30,987.05x = 720,108,561.60
  5. Step 5: Solve for x
    x = 720,108,561.60/30,987.05
  6. Step 6: Final answer
    x = 23,239.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.