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Finding the Fourth Proportional to 612,585.70, 918,878.55 and 443,311.90

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Solution

The fourth proportional to 612,585.70, 918,878.55 and 443,311.90 is: 664,967.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,585.70 : 918,878.55 = 443,311.90 : x
  2. Step 2: Convert to fraction form
    612,585.70/918,878.55 = 443,311.90/x
  3. Step 3: Cross multiply
    612,585.70x = 918,878.55 × 443,311.90
  4. Step 4: Simplify right side
    612,585.70x = 407,349,795,869.75
  5. Step 5: Solve for x
    x = 407,349,795,869.75/612,585.70
  6. Step 6: Final answer
    x = 664,967.85

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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.