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Finding the Fourth Proportional to 485,759.78, 670,119.72 and 315,931.94

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Solution

The fourth proportional to 485,759.78, 670,119.72 and 315,931.94 is: 435,837.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,759.78 : 670,119.72 = 315,931.94 : x
  2. Step 2: Convert to fraction form
    485,759.78/670,119.72 = 315,931.94/x
  3. Step 3: Cross multiply
    485,759.78x = 670,119.72 × 315,931.94
  4. Step 4: Simplify right side
    485,759.78x = 211,712,223,662.41
  5. Step 5: Solve for x
    x = 211,712,223,662.41/485,759.78
  6. Step 6: Final answer
    x = 435,837.28

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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.