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Finding the Fourth Proportional to 18,750.68, 28,125.43 and 7,657.47

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Solution

The fourth proportional to 18,750.68, 28,125.43 and 7,657.47 is: 11,485.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,750.68 : 28,125.43 = 7,657.47 : x
  2. Step 2: Convert to fraction form
    18,750.68/28,125.43 = 7,657.47/x
  3. Step 3: Cross multiply
    18,750.68x = 28,125.43 × 7,657.47
  4. Step 4: Simplify right side
    18,750.68x = 215,369,636.46
  5. Step 5: Solve for x
    x = 215,369,636.46/18,750.68
  6. Step 6: Final answer
    x = 11,485.96

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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.