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Finding the Fourth Proportional to 28,253, 42,379.50 and 9,785

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Solution

The fourth proportional to 28,253, 42,379.50 and 9,785 is: 14,677.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,253 : 42,379.50 = 9,785 : x
  2. Step 2: Convert to fraction form
    28,253/42,379.50 = 9,785/x
  3. Step 3: Cross multiply
    28,253x = 42,379.50 × 9,785
  4. Step 4: Simplify right side
    28,253x = 414,683,407.50
  5. Step 5: Solve for x
    x = 414,683,407.50/28,253
  6. Step 6: Final answer
    x = 14,677.50

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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.