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Finding the Fourth Proportional to 261,661.20, 392,621.40 and 103,894.80

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Solution

The fourth proportional to 261,661.20, 392,621.40 and 103,894.80 is: 155,893.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,661.20 : 392,621.40 = 103,894.80 : x
  2. Step 2: Convert to fraction form
    261,661.20/392,621.40 = 103,894.80/x
  3. Step 3: Cross multiply
    261,661.20x = 392,621.40 × 103,894.80
  4. Step 4: Simplify right side
    261,661.20x = 40,791,321,828.72
  5. Step 5: Solve for x
    x = 40,791,321,828.72/261,661.20
  6. Step 6: Final answer
    x = 155,893.66

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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.