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Finding the Fourth Proportional to 285,438.80, 393,106.56 and 279,239.88

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Solution

The fourth proportional to 285,438.80, 393,106.56 and 279,239.88 is: 384,569.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,438.80 : 393,106.56 = 279,239.88 : x
  2. Step 2: Convert to fraction form
    285,438.80/393,106.56 = 279,239.88/x
  3. Step 3: Cross multiply
    285,438.80x = 393,106.56 × 279,239.88
  4. Step 4: Simplify right side
    285,438.80x = 109,771,028,641.61
  5. Step 5: Solve for x
    x = 109,771,028,641.61/285,438.80
  6. Step 6: Final answer
    x = 384,569.40

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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.