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Finding the Fourth Proportional to 390,380.88, 538,763.40 and 239,576.40

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Solution

The fourth proportional to 390,380.88, 538,763.40 and 239,576.40 is: 330,638.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,380.88 : 538,763.40 = 239,576.40 : x
  2. Step 2: Convert to fraction form
    390,380.88/538,763.40 = 239,576.40/x
  3. Step 3: Cross multiply
    390,380.88x = 538,763.40 × 239,576.40
  4. Step 4: Simplify right side
    390,380.88x = 129,074,995,823.76
  5. Step 5: Solve for x
    x = 129,074,995,823.76/390,380.88
  6. Step 6: Final answer
    x = 330,638.62

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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.