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Finding the Fourth Proportional to 438,074.40, 657,192.72 and 138,630.36

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Solution

The fourth proportional to 438,074.40, 657,192.72 and 138,630.36 is: 207,971.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,074.40 : 657,192.72 = 138,630.36 : x
  2. Step 2: Convert to fraction form
    438,074.40/657,192.72 = 138,630.36/x
  3. Step 3: Cross multiply
    438,074.40x = 657,192.72 × 138,630.36
  4. Step 4: Simplify right side
    438,074.40x = 91,106,863,362.98
  5. Step 5: Solve for x
    x = 91,106,863,362.98/438,074.40
  6. Step 6: Final answer
    x = 207,971.21

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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.