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Finding the Fourth Proportional to 640,748.86, 960,648.75 and 387,969.93

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Solution

The fourth proportional to 640,748.86, 960,648.75 and 387,969.93 is: 581,667.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,748.86 : 960,648.75 = 387,969.93 : x
  2. Step 2: Convert to fraction form
    640,748.86/960,648.75 = 387,969.93/x
  3. Step 3: Cross multiply
    640,748.86x = 960,648.75 × 387,969.93
  4. Step 4: Simplify right side
    640,748.86x = 372,702,828,292.09
  5. Step 5: Solve for x
    x = 372,702,828,292.09/640,748.86
  6. Step 6: Final answer
    x = 581,667.57

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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.