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Finding the Fourth Proportional to 18,478.16, 25,499.86 and 9,980.28

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Solution

The fourth proportional to 18,478.16, 25,499.86 and 9,980.28 is: 13,772.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,478.16 : 25,499.86 = 9,980.28 : x
  2. Step 2: Convert to fraction form
    18,478.16/25,499.86 = 9,980.28/x
  3. Step 3: Cross multiply
    18,478.16x = 25,499.86 × 9,980.28
  4. Step 4: Simplify right side
    18,478.16x = 254,495,742.76
  5. Step 5: Solve for x
    x = 254,495,742.76/18,478.16
  6. Step 6: Final answer
    x = 13,772.79

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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.