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Finding the Fourth Proportional to 84,045.44, 126,071.04 and 28,640

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Solution

The fourth proportional to 84,045.44, 126,071.04 and 28,640 is: 42,960.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,045.44 : 126,071.04 = 28,640 : x
  2. Step 2: Convert to fraction form
    84,045.44/126,071.04 = 28,640/x
  3. Step 3: Cross multiply
    84,045.44x = 126,071.04 × 28,640
  4. Step 4: Simplify right side
    84,045.44x = 3,610,674,585.60
  5. Step 5: Solve for x
    x = 3,610,674,585.60/84,045.44
  6. Step 6: Final answer
    x = 42,960.98

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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.