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Finding the Fourth Proportional to 258,485.99, 387,729.12 and 81,006.89

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Solution

The fourth proportional to 258,485.99, 387,729.12 and 81,006.89 is: 121,510.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,485.99 : 387,729.12 = 81,006.89 : x
  2. Step 2: Convert to fraction form
    258,485.99/387,729.12 = 81,006.89/x
  3. Step 3: Cross multiply
    258,485.99x = 387,729.12 × 81,006.89
  4. Step 4: Simplify right side
    258,485.99x = 31,408,730,173.64
  5. Step 5: Solve for x
    x = 31,408,730,173.64/258,485.99
  6. Step 6: Final answer
    x = 121,510.38

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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.