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Finding the Fourth Proportional to 310,466.48, 428,438.64 and 172,639.92

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Solution

The fourth proportional to 310,466.48, 428,438.64 and 172,639.92 is: 238,240.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,466.48 : 428,438.64 = 172,639.92 : x
  2. Step 2: Convert to fraction form
    310,466.48/428,438.64 = 172,639.92/x
  3. Step 3: Cross multiply
    310,466.48x = 428,438.64 × 172,639.92
  4. Step 4: Simplify right side
    310,466.48x = 73,965,612,534.51
  5. Step 5: Solve for x
    x = 73,965,612,534.51/310,466.48
  6. Step 6: Final answer
    x = 238,240.25

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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.