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Finding the Fourth Proportional to 318,643.20, 477,964.80 and 219,110.40

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Solution

The fourth proportional to 318,643.20, 477,964.80 and 219,110.40 is: 328,665.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,643.20 : 477,964.80 = 219,110.40 : x
  2. Step 2: Convert to fraction form
    318,643.20/477,964.80 = 219,110.40/x
  3. Step 3: Cross multiply
    318,643.20x = 477,964.80 × 219,110.40
  4. Step 4: Simplify right side
    318,643.20x = 104,727,058,513.92
  5. Step 5: Solve for x
    x = 104,727,058,513.92/318,643.20
  6. Step 6: Final answer
    x = 328,665.60

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.