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Finding the Fourth Proportional to 645,111.13, 890,283.75 and 358,636

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Solution

The fourth proportional to 645,111.13, 890,283.75 and 358,636 is: 494,934.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,111.13 : 890,283.75 = 358,636 : x
  2. Step 2: Convert to fraction form
    645,111.13/890,283.75 = 358,636/x
  3. Step 3: Cross multiply
    645,111.13x = 890,283.75 × 358,636
  4. Step 4: Simplify right side
    645,111.13x = 319,287,802,965
  5. Step 5: Solve for x
    x = 319,287,802,965/645,111.13
  6. Step 6: Final answer
    x = 494,934.58

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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.