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Finding the Fourth Proportional to 423,890.40, 636,872.40 and 318,914.40

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Solution

The fourth proportional to 423,890.40, 636,872.40 and 318,914.40 is: 479,151.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,890.40 : 636,872.40 = 318,914.40 : x
  2. Step 2: Convert to fraction form
    423,890.40/636,872.40 = 318,914.40/x
  3. Step 3: Cross multiply
    423,890.40x = 636,872.40 × 318,914.40
  4. Step 4: Simplify right side
    423,890.40x = 203,107,779,322.56
  5. Step 5: Solve for x
    x = 203,107,779,322.56/423,890.40
  6. Step 6: Final answer
    x = 479,151.64

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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.