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Finding the Fourth Proportional to 27,720.69, 38,248.89 and 15,780.89

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Solution

The fourth proportional to 27,720.69, 38,248.89 and 15,780.89 is: 21,774.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,720.69 : 38,248.89 = 15,780.89 : x
  2. Step 2: Convert to fraction form
    27,720.69/38,248.89 = 15,780.89/x
  3. Step 3: Cross multiply
    27,720.69x = 38,248.89 × 15,780.89
  4. Step 4: Simplify right side
    27,720.69x = 603,601,525.71
  5. Step 5: Solve for x
    x = 603,601,525.71/27,720.69
  6. Step 6: Final answer
    x = 21,774.40

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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.