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Finding the Fourth Proportional to 511,487.10, 705,592.80 and 390,418.20

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Solution

The fourth proportional to 511,487.10, 705,592.80 and 390,418.20 is: 538,579.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    511,487.10 : 705,592.80 = 390,418.20 : x
  2. Step 2: Convert to fraction form
    511,487.10/705,592.80 = 390,418.20/x
  3. Step 3: Cross multiply
    511,487.10x = 705,592.80 × 390,418.20
  4. Step 4: Simplify right side
    511,487.10x = 275,476,270,908.96
  5. Step 5: Solve for x
    x = 275,476,270,908.96/511,487.10
  6. Step 6: Final answer
    x = 538,579.12

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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.