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Finding the Fourth Proportional to 390,506.72, 538,892.14 and 220,740.85

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Solution

The fourth proportional to 390,506.72, 538,892.14 and 220,740.85 is: 304,618.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,506.72 : 538,892.14 = 220,740.85 : x
  2. Step 2: Convert to fraction form
    390,506.72/538,892.14 = 220,740.85/x
  3. Step 3: Cross multiply
    390,506.72x = 538,892.14 × 220,740.85
  4. Step 4: Simplify right side
    390,506.72x = 118,955,506,546.30
  5. Step 5: Solve for x
    x = 118,955,506,546.30/390,506.72
  6. Step 6: Final answer
    x = 304,618.33

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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.