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Finding the Fourth Proportional to 509,077.80, 763,616.70 and 391,343.40

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Solution

The fourth proportional to 509,077.80, 763,616.70 and 391,343.40 is: 587,015.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,077.80 : 763,616.70 = 391,343.40 : x
  2. Step 2: Convert to fraction form
    509,077.80/763,616.70 = 391,343.40/x
  3. Step 3: Cross multiply
    509,077.80x = 763,616.70 × 391,343.40
  4. Step 4: Simplify right side
    509,077.80x = 298,836,355,674.78
  5. Step 5: Solve for x
    x = 298,836,355,674.78/509,077.80
  6. Step 6: Final answer
    x = 587,015.10

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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.