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Finding the Fourth Proportional to 28,319.99, 39,081.72 and 15,573.99

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Solution

The fourth proportional to 28,319.99, 39,081.72 and 15,573.99 is: 21,492.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,319.99 : 39,081.72 = 15,573.99 : x
  2. Step 2: Convert to fraction form
    28,319.99/39,081.72 = 15,573.99/x
  3. Step 3: Cross multiply
    28,319.99x = 39,081.72 × 15,573.99
  4. Step 4: Simplify right side
    28,319.99x = 608,658,316.46
  5. Step 5: Solve for x
    x = 608,658,316.46/28,319.99
  6. Step 6: Final answer
    x = 21,492.18

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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.