Home / 642,514.40-963,771.60-405,087.20

Finding the Fourth Proportional to 642,514.40, 963,771.60 and 405,087.20

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Solution

The fourth proportional to 642,514.40, 963,771.60 and 405,087.20 is: 607,630.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,514.40 : 963,771.60 = 405,087.20 : x
  2. Step 2: Convert to fraction form
    642,514.40/963,771.60 = 405,087.20/x
  3. Step 3: Cross multiply
    642,514.40x = 963,771.60 × 405,087.20
  4. Step 4: Simplify right side
    642,514.40x = 390,411,538,883.52
  5. Step 5: Solve for x
    x = 390,411,538,883.52/642,514.40
  6. Step 6: Final answer
    x = 607,630.80

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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.