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Finding the Fourth Proportional to 439,853.40, 659,780.10 and 385,615.80

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Solution

The fourth proportional to 439,853.40, 659,780.10 and 385,615.80 is: 578,423.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,853.40 : 659,780.10 = 385,615.80 : x
  2. Step 2: Convert to fraction form
    439,853.40/659,780.10 = 385,615.80/x
  3. Step 3: Cross multiply
    439,853.40x = 659,780.10 × 385,615.80
  4. Step 4: Simplify right side
    439,853.40x = 254,421,631,085.58
  5. Step 5: Solve for x
    x = 254,421,631,085.58/439,853.40
  6. Step 6: Final answer
    x = 578,423.70

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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.