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Finding the Fourth Proportional to 640,139.49, 959,585.16 and 255,773.76

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Solution

The fourth proportional to 640,139.49, 959,585.16 and 255,773.76 is: 383,411.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,139.49 : 959,585.16 = 255,773.76 : x
  2. Step 2: Convert to fraction form
    640,139.49/959,585.16 = 255,773.76/x
  3. Step 3: Cross multiply
    640,139.49x = 959,585.16 × 255,773.76
  4. Step 4: Simplify right side
    640,139.49x = 245,436,704,413.40
  5. Step 5: Solve for x
    x = 245,436,704,413.40/640,139.49
  6. Step 6: Final answer
    x = 383,411.28

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1.5x scale

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.