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Finding the Fourth Proportional to 643,486.40, 966,007.20 and 638,820.80

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Solution

The fourth proportional to 643,486.40, 966,007.20 and 638,820.80 is: 959,003.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,486.40 : 966,007.20 = 638,820.80 : x
  2. Step 2: Convert to fraction form
    643,486.40/966,007.20 = 638,820.80/x
  3. Step 3: Cross multiply
    643,486.40x = 966,007.20 × 638,820.80
  4. Step 4: Simplify right side
    643,486.40x = 617,105,492,309.76
  5. Step 5: Solve for x
    x = 617,105,492,309.76/643,486.40
  6. Step 6: Final answer
    x = 959,003.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.