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Finding the Fourth Proportional to 30,358.72, 41,898.02 and 18,421.12

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Solution

The fourth proportional to 30,358.72, 41,898.02 and 18,421.12 is: 25,422.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,358.72 : 41,898.02 = 18,421.12 : x
  2. Step 2: Convert to fraction form
    30,358.72/41,898.02 = 18,421.12/x
  3. Step 3: Cross multiply
    30,358.72x = 41,898.02 × 18,421.12
  4. Step 4: Simplify right side
    30,358.72x = 771,808,454.18
  5. Step 5: Solve for x
    x = 771,808,454.18/30,358.72
  6. Step 6: Final answer
    x = 25,422.96

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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.