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Finding the Fourth Proportional to 30,636.76, 45,969.72 and 13,988.20

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Solution

The fourth proportional to 30,636.76, 45,969.72 and 13,988.20 is: 20,988.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,636.76 : 45,969.72 = 13,988.20 : x
  2. Step 2: Convert to fraction form
    30,636.76/45,969.72 = 13,988.20/x
  3. Step 3: Cross multiply
    30,636.76x = 45,969.72 × 13,988.20
  4. Step 4: Simplify right side
    30,636.76x = 643,033,637.30
  5. Step 5: Solve for x
    x = 643,033,637.30/30,636.76
  6. Step 6: Final answer
    x = 20,988.96

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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.