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Finding the Fourth Proportional to 398,779.80, 598,169.70 and 266,069.40

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Solution

The fourth proportional to 398,779.80, 598,169.70 and 266,069.40 is: 399,104.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,779.80 : 598,169.70 = 266,069.40 : x
  2. Step 2: Convert to fraction form
    398,779.80/598,169.70 = 266,069.40/x
  3. Step 3: Cross multiply
    398,779.80x = 598,169.70 × 266,069.40
  4. Step 4: Simplify right side
    398,779.80x = 159,154,653,177.18
  5. Step 5: Solve for x
    x = 159,154,653,177.18/398,779.80
  6. Step 6: Final answer
    x = 399,104.10

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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.