Home / 645,465.85-890,774.42-358,979.78

Finding the Fourth Proportional to 645,465.85, 890,774.42 and 358,979.78

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Solution

The fourth proportional to 645,465.85, 890,774.42 and 358,979.78 is: 495,409.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,465.85 : 890,774.42 = 358,979.78 : x
  2. Step 2: Convert to fraction form
    645,465.85/890,774.42 = 358,979.78/x
  3. Step 3: Cross multiply
    645,465.85x = 890,774.42 × 358,979.78
  4. Step 4: Simplify right side
    645,465.85x = 319,770,005,753.27
  5. Step 5: Solve for x
    x = 319,770,005,753.27/645,465.85
  6. Step 6: Final answer
    x = 495,409.64

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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.