Home / 812,111.70-1,218,167.55-391,430.10

Finding the Fourth Proportional to 812,111.70, 1,218,167.55 and 391,430.10

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Solution

The fourth proportional to 812,111.70, 1,218,167.55 and 391,430.10 is: 587,145.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,111.70 : 1,218,167.55 = 391,430.10 : x
  2. Step 2: Convert to fraction form
    812,111.70/1,218,167.55 = 391,430.10/x
  3. Step 3: Cross multiply
    812,111.70x = 1,218,167.55 × 391,430.10
  4. Step 4: Simplify right side
    812,111.70x = 476,827,445,913.26
  5. Step 5: Solve for x
    x = 476,827,445,913.26/812,111.70
  6. Step 6: Final answer
    x = 587,145.15

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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.