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Finding the Fourth Proportional to 256,748.40, 384,604.20 and 145,810.80

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Solution

The fourth proportional to 256,748.40, 384,604.20 and 145,810.80 is: 218,421.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,748.40 : 384,604.20 = 145,810.80 : x
  2. Step 2: Convert to fraction form
    256,748.40/384,604.20 = 145,810.80/x
  3. Step 3: Cross multiply
    256,748.40x = 384,604.20 × 145,810.80
  4. Step 4: Simplify right side
    256,748.40x = 56,079,446,085.36
  5. Step 5: Solve for x
    x = 56,079,446,085.36/256,748.40
  6. Step 6: Final answer
    x = 218,421.79

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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.