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Finding the Fourth Proportional to 640,177.25, 959,438.05 and 478,988.51

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Solution

The fourth proportional to 640,177.25, 959,438.05 and 478,988.51 is: 717,863.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,177.25 : 959,438.05 = 478,988.51 : x
  2. Step 2: Convert to fraction form
    640,177.25/959,438.05 = 478,988.51/x
  3. Step 3: Cross multiply
    640,177.25x = 959,438.05 × 478,988.51
  4. Step 4: Simplify right side
    640,177.25x = 459,559,804,107.40
  5. Step 5: Solve for x
    x = 459,559,804,107.40/640,177.25
  6. Step 6: Final answer
    x = 717,863.38

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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.