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Finding the Fourth Proportional to 21,903.20, 32,858.40 and 9,429.20

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Solution

The fourth proportional to 21,903.20, 32,858.40 and 9,429.20 is: 14,145.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,903.20 : 32,858.40 = 9,429.20 : x
  2. Step 2: Convert to fraction form
    21,903.20/32,858.40 = 9,429.20/x
  3. Step 3: Cross multiply
    21,903.20x = 32,858.40 × 9,429.20
  4. Step 4: Simplify right side
    21,903.20x = 309,828,425.28
  5. Step 5: Solve for x
    x = 309,828,425.28/21,903.20
  6. Step 6: Final answer
    x = 14,145.35

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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.