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Finding the Fourth Proportional to 18,303.64, 25,258.96 and 9,920.16

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Solution

The fourth proportional to 18,303.64, 25,258.96 and 9,920.16 is: 13,689.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,303.64 : 25,258.96 = 9,920.16 : x
  2. Step 2: Convert to fraction form
    18,303.64/25,258.96 = 9,920.16/x
  3. Step 3: Cross multiply
    18,303.64x = 25,258.96 × 9,920.16
  4. Step 4: Simplify right side
    18,303.64x = 250,572,924.63
  5. Step 5: Solve for x
    x = 250,572,924.63/18,303.64
  6. Step 6: Final answer
    x = 13,689.79

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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.