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Finding the Fourth Proportional to 612,720.80, 919,081.20 and 455,256.80

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Solution

The fourth proportional to 612,720.80, 919,081.20 and 455,256.80 is: 682,885.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,720.80 : 919,081.20 = 455,256.80 : x
  2. Step 2: Convert to fraction form
    612,720.80/919,081.20 = 455,256.80/x
  3. Step 3: Cross multiply
    612,720.80x = 919,081.20 × 455,256.80
  4. Step 4: Simplify right side
    612,720.80x = 418,417,966,052.16
  5. Step 5: Solve for x
    x = 418,417,966,052.16/612,720.80
  6. Step 6: Final answer
    x = 682,885.20

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Similar ratio
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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.