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Finding the Fourth Proportional to 390,744.34, 539,108.13 and 218,644.45

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Solution

The fourth proportional to 390,744.34, 539,108.13 and 218,644.45 is: 301,662.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,744.34 : 539,108.13 = 218,644.45 : x
  2. Step 2: Convert to fraction form
    390,744.34/539,108.13 = 218,644.45/x
  3. Step 3: Cross multiply
    390,744.34x = 539,108.13 × 218,644.45
  4. Step 4: Simplify right side
    390,744.34x = 117,873,000,574.38
  5. Step 5: Solve for x
    x = 117,873,000,574.38/390,744.34
  6. Step 6: Final answer
    x = 301,662.72

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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.