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Finding the Fourth Proportional to 258,306.30, 387,459.45 and 80,814.85

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Solution

The fourth proportional to 258,306.30, 387,459.45 and 80,814.85 is: 121,222.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,306.30 : 387,459.45 = 80,814.85 : x
  2. Step 2: Convert to fraction form
    258,306.30/387,459.45 = 80,814.85/x
  3. Step 3: Cross multiply
    258,306.30x = 387,459.45 × 80,814.85
  4. Step 4: Simplify right side
    258,306.30x = 31,312,476,364.18
  5. Step 5: Solve for x
    x = 31,312,476,364.18/258,306.30
  6. Step 6: Final answer
    x = 121,222.27

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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.