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Finding the Fourth Proportional to 511,421.32, 705,502.02 and 390,352.42

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Solution

The fourth proportional to 511,421.32, 705,502.02 and 390,352.42 is: 538,488.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    511,421.32 : 705,502.02 = 390,352.42 : x
  2. Step 2: Convert to fraction form
    511,421.32/705,502.02 = 390,352.42/x
  3. Step 3: Cross multiply
    511,421.32x = 705,502.02 × 390,352.42
  4. Step 4: Simplify right side
    511,421.32x = 275,394,420,821.89
  5. Step 5: Solve for x
    x = 275,394,420,821.89/511,421.32
  6. Step 6: Final answer
    x = 538,488.35

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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.