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Finding the Fourth Proportional to 18,281, 27,421.66 and 4,430

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Solution

The fourth proportional to 18,281, 27,421.66 and 4,430 is: 6,645.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,281 : 27,421.66 = 4,430 : x
  2. Step 2: Convert to fraction form
    18,281/27,421.66 = 4,430/x
  3. Step 3: Cross multiply
    18,281x = 27,421.66 × 4,430
  4. Step 4: Simplify right side
    18,281x = 121,477,953.80
  5. Step 5: Solve for x
    x = 121,477,953.80/18,281
  6. Step 6: Final answer
    x = 6,645.04

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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.