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Finding the Fourth Proportional to 645,473.91, 890,785.53 and 358,987.86

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Solution

The fourth proportional to 645,473.91, 890,785.53 and 358,987.86 is: 495,420.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,473.91 : 890,785.53 = 358,987.86 : x
  2. Step 2: Convert to fraction form
    645,473.91/890,785.53 = 358,987.86/x
  3. Step 3: Cross multiply
    645,473.91x = 890,785.53 × 358,987.86
  4. Step 4: Simplify right side
    645,473.91x = 319,781,191,133.67
  5. Step 5: Solve for x
    x = 319,781,191,133.67/645,473.91
  6. Step 6: Final answer
    x = 495,420.78

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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.