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Finding the Fourth Proportional to 645,464.85, 890,773.05 and 358,978.79

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Solution

The fourth proportional to 645,464.85, 890,773.05 and 358,978.79 is: 495,408.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,464.85 : 890,773.05 = 358,978.79 : x
  2. Step 2: Convert to fraction form
    645,464.85/890,773.05 = 358,978.79/x
  3. Step 3: Cross multiply
    645,464.85x = 890,773.05 × 358,978.79
  4. Step 4: Simplify right side
    645,464.85x = 319,768,631,653.61
  5. Step 5: Solve for x
    x = 319,768,631,653.61/645,464.85
  6. Step 6: Final answer
    x = 495,408.28

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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.