Home / 643,575.40-965,363.10-406,148.20

Finding the Fourth Proportional to 643,575.40, 965,363.10 and 406,148.20

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Solution

The fourth proportional to 643,575.40, 965,363.10 and 406,148.20 is: 609,222.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,575.40 : 965,363.10 = 406,148.20 : x
  2. Step 2: Convert to fraction form
    643,575.40/965,363.10 = 406,148.20/x
  3. Step 3: Cross multiply
    643,575.40x = 965,363.10 × 406,148.20
  4. Step 4: Simplify right side
    643,575.40x = 392,080,485,411.42
  5. Step 5: Solve for x
    x = 392,080,485,411.42/643,575.40
  6. Step 6: Final answer
    x = 609,222.30

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Double scale
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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.