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Finding the Fourth Proportional to 28,434.48, 42,567.48 and 21,072

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Solution

The fourth proportional to 28,434.48, 42,567.48 and 21,072 is: 31,545.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,434.48 : 42,567.48 = 21,072 : x
  2. Step 2: Convert to fraction form
    28,434.48/42,567.48 = 21,072/x
  3. Step 3: Cross multiply
    28,434.48x = 42,567.48 × 21,072
  4. Step 4: Simplify right side
    28,434.48x = 896,981,938.56
  5. Step 5: Solve for x
    x = 896,981,938.56/28,434.48
  6. Step 6: Final answer
    x = 31,545.57

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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.