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Finding the Fourth Proportional to 511,245.60, 705,259.65 and 390,176.70

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Solution

The fourth proportional to 511,245.60, 705,259.65 and 390,176.70 is: 538,245.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    511,245.60 : 705,259.65 = 390,176.70 : x
  2. Step 2: Convert to fraction form
    511,245.60/705,259.65 = 390,176.70/x
  3. Step 3: Cross multiply
    511,245.60x = 705,259.65 × 390,176.70
  4. Step 4: Simplify right side
    511,245.60x = 275,175,882,880.16
  5. Step 5: Solve for x
    x = 275,175,882,880.16/511,245.60
  6. Step 6: Final answer
    x = 538,245.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.