Home / 865,811.40-1,298,717.10-393,419.40

Finding the Fourth Proportional to 865,811.40, 1,298,717.10 and 393,419.40

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Solution

The fourth proportional to 865,811.40, 1,298,717.10 and 393,419.40 is: 590,129.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,811.40 : 1,298,717.10 = 393,419.40 : x
  2. Step 2: Convert to fraction form
    865,811.40/1,298,717.10 = 393,419.40/x
  3. Step 3: Cross multiply
    865,811.40x = 1,298,717.10 × 393,419.40
  4. Step 4: Simplify right side
    865,811.40x = 510,940,502,251.74
  5. Step 5: Solve for x
    x = 510,940,502,251.74/865,811.40
  6. Step 6: Final answer
    x = 590,129.10

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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.