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Finding the Fourth Proportional to 439,810.40, 659,715.60 and 385,572.80

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Solution

The fourth proportional to 439,810.40, 659,715.60 and 385,572.80 is: 578,359.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,810.40 : 659,715.60 = 385,572.80 : x
  2. Step 2: Convert to fraction form
    439,810.40/659,715.60 = 385,572.80/x
  3. Step 3: Cross multiply
    439,810.40x = 659,715.60 × 385,572.80
  4. Step 4: Simplify right side
    439,810.40x = 254,368,391,095.68
  5. Step 5: Solve for x
    x = 254,368,391,095.68/439,810.40
  6. Step 6: Final answer
    x = 578,359.20

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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.