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Finding the Fourth Proportional to 612,076.80, 918,115.20 and 413,011.20

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Solution

The fourth proportional to 612,076.80, 918,115.20 and 413,011.20 is: 619,516.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,076.80 : 918,115.20 = 413,011.20 : x
  2. Step 2: Convert to fraction form
    612,076.80/918,115.20 = 413,011.20/x
  3. Step 3: Cross multiply
    612,076.80x = 918,115.20 × 413,011.20
  4. Step 4: Simplify right side
    612,076.80x = 379,191,860,490.24
  5. Step 5: Solve for x
    x = 379,191,860,490.24/612,076.80
  6. Step 6: Final answer
    x = 619,516.80

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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.