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Finding the Fourth Proportional to 438,570.17, 657,878.58 and 139,074.38

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Solution

The fourth proportional to 438,570.17, 657,878.58 and 139,074.38 is: 208,618.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,570.17 : 657,878.58 = 139,074.38 : x
  2. Step 2: Convert to fraction form
    438,570.17/657,878.58 = 139,074.38/x
  3. Step 3: Cross multiply
    438,570.17x = 657,878.58 × 139,074.38
  4. Step 4: Simplify right side
    438,570.17x = 91,494,055,628.78
  5. Step 5: Solve for x
    x = 91,494,055,628.78/438,570.17
  6. Step 6: Final answer
    x = 208,618.97

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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.