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Finding the Fourth Proportional to 20,995.80, 28,966.80 and 13,443.36

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Solution

The fourth proportional to 20,995.80, 28,966.80 and 13,443.36 is: 18,547.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,995.80 : 28,966.80 = 13,443.36 : x
  2. Step 2: Convert to fraction form
    20,995.80/28,966.80 = 13,443.36/x
  3. Step 3: Cross multiply
    20,995.80x = 28,966.80 × 13,443.36
  4. Step 4: Simplify right side
    20,995.80x = 389,411,120.45
  5. Step 5: Solve for x
    x = 389,411,120.45/20,995.80
  6. Step 6: Final answer
    x = 18,547.10

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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.