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Finding the Fourth Proportional to 318,459.87, 439,106.40 and 253,878.57

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Solution

The fourth proportional to 318,459.87, 439,106.40 and 253,878.57 is: 350,058.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,459.87 : 439,106.40 = 253,878.57 : x
  2. Step 2: Convert to fraction form
    318,459.87/439,106.40 = 253,878.57/x
  3. Step 3: Cross multiply
    318,459.87x = 439,106.40 × 253,878.57
  4. Step 4: Simplify right side
    318,459.87x = 111,479,704,909.85
  5. Step 5: Solve for x
    x = 111,479,704,909.85/318,459.87
  6. Step 6: Final answer
    x = 350,058.88

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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.