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Finding the Fourth Proportional to 645,988.50, 891,455.42 and 359,508.51

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Solution

The fourth proportional to 645,988.50, 891,455.42 and 359,508.51 is: 496,116.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,988.50 : 891,455.42 = 359,508.51 : x
  2. Step 2: Convert to fraction form
    645,988.50/891,455.42 = 359,508.51/x
  3. Step 3: Cross multiply
    645,988.50x = 891,455.42 × 359,508.51
  4. Step 4: Simplify right side
    645,988.50x = 320,485,809,775.62
  5. Step 5: Solve for x
    x = 320,485,809,775.62/645,988.50
  6. Step 6: Final answer
    x = 496,116.90

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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.