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Finding the Fourth Proportional to 258,689.80, 388,034.70 and 219,323.80

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Solution

The fourth proportional to 258,689.80, 388,034.70 and 219,323.80 is: 328,985.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,689.80 : 388,034.70 = 219,323.80 : x
  2. Step 2: Convert to fraction form
    258,689.80/388,034.70 = 219,323.80/x
  3. Step 3: Cross multiply
    258,689.80x = 388,034.70 × 219,323.80
  4. Step 4: Simplify right side
    258,689.80x = 85,105,244,935.86
  5. Step 5: Solve for x
    x = 85,105,244,935.86/258,689.80
  6. Step 6: Final answer
    x = 328,985.70

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1.5x scale

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.