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Finding the Fourth Proportional to 285,816.61, 428,725.07 and 72,600.51

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Solution

The fourth proportional to 285,816.61, 428,725.07 and 72,600.51 is: 108,900.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,816.61 : 428,725.07 = 72,600.51 : x
  2. Step 2: Convert to fraction form
    285,816.61/428,725.07 = 72,600.51/x
  3. Step 3: Cross multiply
    285,816.61x = 428,725.07 × 72,600.51
  4. Step 4: Simplify right side
    285,816.61x = 31,125,658,368.78
  5. Step 5: Solve for x
    x = 31,125,658,368.78/285,816.61
  6. Step 6: Final answer
    x = 108,900.80

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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.