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Finding the Fourth Proportional to 84,721.81, 127,045.80 and 28,551.45

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Solution

The fourth proportional to 84,721.81, 127,045.80 and 28,551.45 is: 42,814.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,721.81 : 127,045.80 = 28,551.45 : x
  2. Step 2: Convert to fraction form
    84,721.81/127,045.80 = 28,551.45/x
  3. Step 3: Cross multiply
    84,721.81x = 127,045.80 × 28,551.45
  4. Step 4: Simplify right side
    84,721.81x = 3,627,341,806.41
  5. Step 5: Solve for x
    x = 3,627,341,806.41/84,721.81
  6. Step 6: Final answer
    x = 42,814.73

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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.