Home / 839,909.40-1,259,864.10-420,005.40

Finding the Fourth Proportional to 839,909.40, 1,259,864.10 and 420,005.40

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Solution

The fourth proportional to 839,909.40, 1,259,864.10 and 420,005.40 is: 630,008.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    839,909.40 : 1,259,864.10 = 420,005.40 : x
  2. Step 2: Convert to fraction form
    839,909.40/1,259,864.10 = 420,005.40/x
  3. Step 3: Cross multiply
    839,909.40x = 1,259,864.10 × 420,005.40
  4. Step 4: Simplify right side
    839,909.40x = 529,149,725,266.14
  5. Step 5: Solve for x
    x = 529,149,725,266.14/839,909.40
  6. Step 6: Final answer
    x = 630,008.10

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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.