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Finding the Fourth Proportional to 612,143.70, 918,215.55 and 443,307.30

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Solution

The fourth proportional to 612,143.70, 918,215.55 and 443,307.30 is: 664,960.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,143.70 : 918,215.55 = 443,307.30 : x
  2. Step 2: Convert to fraction form
    612,143.70/918,215.55 = 443,307.30/x
  3. Step 3: Cross multiply
    612,143.70x = 918,215.55 × 443,307.30
  4. Step 4: Simplify right side
    612,143.70x = 407,051,656,288.52
  5. Step 5: Solve for x
    x = 407,051,656,288.52/612,143.70
  6. Step 6: Final answer
    x = 664,960.95

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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.