Home / 645,128.14-890,226.40-358,630.78

Finding the Fourth Proportional to 645,128.14, 890,226.40 and 358,630.78

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Solution

The fourth proportional to 645,128.14, 890,226.40 and 358,630.78 is: 494,882.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,128.14 : 890,226.40 = 358,630.78 : x
  2. Step 2: Convert to fraction form
    645,128.14/890,226.40 = 358,630.78/x
  3. Step 3: Cross multiply
    645,128.14x = 890,226.40 × 358,630.78
  4. Step 4: Simplify right side
    645,128.14x = 319,262,581,964.31
  5. Step 5: Solve for x
    x = 319,262,581,964.31/645,128.14
  6. Step 6: Final answer
    x = 494,882.43

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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.