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Finding the Fourth Proportional to 230,888.61, 318,623.25 and 128,915.80

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Solution

The fourth proportional to 230,888.61, 318,623.25 and 128,915.80 is: 177,902.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    230,888.61 : 318,623.25 = 128,915.80 : x
  2. Step 2: Convert to fraction form
    230,888.61/318,623.25 = 128,915.80/x
  3. Step 3: Cross multiply
    230,888.61x = 318,623.25 × 128,915.80
  4. Step 4: Simplify right side
    230,888.61x = 41,075,570,859.23
  5. Step 5: Solve for x
    x = 41,075,570,859.23/230,888.61
  6. Step 6: Final answer
    x = 177,902.11

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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.