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Finding the Fourth Proportional to 389,428.80, 581,326.20 and 342,189.60

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Solution

The fourth proportional to 389,428.80, 581,326.20 and 342,189.60 is: 510,809.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,428.80 : 581,326.20 = 342,189.60 : x
  2. Step 2: Convert to fraction form
    389,428.80/581,326.20 = 342,189.60/x
  3. Step 3: Cross multiply
    389,428.80x = 581,326.20 × 342,189.60
  4. Step 4: Simplify right side
    389,428.80x = 198,923,779,847.52
  5. Step 5: Solve for x
    x = 198,923,779,847.52/389,428.80
  6. Step 6: Final answer
    x = 510,809.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.