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Finding the Fourth Proportional to 258,048.60, 387,072.90 and 218,779.80

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Solution

The fourth proportional to 258,048.60, 387,072.90 and 218,779.80 is: 328,169.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,048.60 : 387,072.90 = 218,779.80 : x
  2. Step 2: Convert to fraction form
    258,048.60/387,072.90 = 218,779.80/x
  3. Step 3: Cross multiply
    258,048.60x = 387,072.90 × 218,779.80
  4. Step 4: Simplify right side
    258,048.60x = 84,683,731,647.42
  5. Step 5: Solve for x
    x = 84,683,731,647.42/258,048.60
  6. Step 6: Final answer
    x = 328,169.70

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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.