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Finding the Fourth Proportional to 39,885.16, 55,041.88 and 21,980.80

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Solution

The fourth proportional to 39,885.16, 55,041.88 and 21,980.80 is: 30,333.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,885.16 : 55,041.88 = 21,980.80 : x
  2. Step 2: Convert to fraction form
    39,885.16/55,041.88 = 21,980.80/x
  3. Step 3: Cross multiply
    39,885.16x = 55,041.88 × 21,980.80
  4. Step 4: Simplify right side
    39,885.16x = 1,209,864,555.90
  5. Step 5: Solve for x
    x = 1,209,864,555.90/39,885.16
  6. Step 6: Final answer
    x = 30,333.70

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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.