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Finding the Fourth Proportional to 645,474.91, 890,786.91 and 358,988.86

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Solution

The fourth proportional to 645,474.91, 890,786.91 and 358,988.86 is: 495,422.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,474.91 : 890,786.91 = 358,988.86 : x
  2. Step 2: Convert to fraction form
    645,474.91/890,786.91 = 358,988.86/x
  3. Step 3: Cross multiply
    645,474.91x = 890,786.91 × 358,988.86
  4. Step 4: Simplify right side
    645,474.91x = 319,782,577,323.82
  5. Step 5: Solve for x
    x = 319,782,577,323.82/645,474.91
  6. Step 6: Final answer
    x = 495,422.16

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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.