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Finding the Fourth Proportional to 390,404.28, 538,735.55 and 215,964.07

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Solution

The fourth proportional to 390,404.28, 538,735.55 and 215,964.07 is: 298,018.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,404.28 : 538,735.55 = 215,964.07 : x
  2. Step 2: Convert to fraction form
    390,404.28/538,735.55 = 215,964.07/x
  3. Step 3: Cross multiply
    390,404.28x = 538,735.55 × 215,964.07
  4. Step 4: Simplify right side
    390,404.28x = 116,347,523,242.82
  5. Step 5: Solve for x
    x = 116,347,523,242.82/390,404.28
  6. Step 6: Final answer
    x = 298,018.06

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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.