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Finding the Fourth Proportional to 70,038.78, 96,661.80 and 39,828.63

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Solution

The fourth proportional to 70,038.78, 96,661.80 and 39,828.63 is: 54,968.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,038.78 : 96,661.80 = 39,828.63 : x
  2. Step 2: Convert to fraction form
    70,038.78/96,661.80 = 39,828.63/x
  3. Step 3: Cross multiply
    70,038.78x = 96,661.80 × 39,828.63
  4. Step 4: Simplify right side
    70,038.78x = 3,849,907,429.82
  5. Step 5: Solve for x
    x = 3,849,907,429.82/70,038.78
  6. Step 6: Final answer
    x = 54,968.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.