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Finding the Fourth Proportional to 30,647.66, 42,301.08 and 18,721.04

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Solution

The fourth proportional to 30,647.66, 42,301.08 and 18,721.04 is: 25,839.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,647.66 : 42,301.08 = 18,721.04 : x
  2. Step 2: Convert to fraction form
    30,647.66/42,301.08 = 18,721.04/x
  3. Step 3: Cross multiply
    30,647.66x = 42,301.08 × 18,721.04
  4. Step 4: Simplify right side
    30,647.66x = 791,920,210.72
  5. Step 5: Solve for x
    x = 791,920,210.72/30,647.66
  6. Step 6: Final answer
    x = 25,839.50

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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.