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Finding the Fourth Proportional to 858,779.60, 1,287,780.60 and 326,123.60

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Solution

The fourth proportional to 858,779.60, 1,287,780.60 and 326,123.60 is: 489,037.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,779.60 : 1,287,780.60 = 326,123.60 : x
  2. Step 2: Convert to fraction form
    858,779.60/1,287,780.60 = 326,123.60/x
  3. Step 3: Cross multiply
    858,779.60x = 1,287,780.60 × 326,123.60
  4. Step 4: Simplify right side
    858,779.60x = 419,975,645,282.16
  5. Step 5: Solve for x
    x = 419,975,645,282.16/858,779.60
  6. Step 6: Final answer
    x = 489,037.75

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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.