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Finding the Fourth Proportional to 390,528.98, 538,775.90 and 245,249.30

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Solution

The fourth proportional to 390,528.98, 538,775.90 and 245,249.30 is: 338,347.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,528.98 : 538,775.90 = 245,249.30 : x
  2. Step 2: Convert to fraction form
    390,528.98/538,775.90 = 245,249.30/x
  3. Step 3: Cross multiply
    390,528.98x = 538,775.90 × 245,249.30
  4. Step 4: Simplify right side
    390,528.98x = 132,134,413,372.25
  5. Step 5: Solve for x
    x = 132,134,413,372.25/390,528.98
  6. Step 6: Final answer
    x = 338,347.27

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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.