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Finding the Fourth Proportional to 660,963.76, 989,907.78 and 642,781.01

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Solution

The fourth proportional to 660,963.76, 989,907.78 and 642,781.01 is: 962,675.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,963.76 : 989,907.78 = 642,781.01 : x
  2. Step 2: Convert to fraction form
    660,963.76/989,907.78 = 642,781.01/x
  3. Step 3: Cross multiply
    660,963.76x = 989,907.78 × 642,781.01
  4. Step 4: Simplify right side
    660,963.76x = 636,293,922,635.26
  5. Step 5: Solve for x
    x = 636,293,922,635.26/660,963.76
  6. Step 6: Final answer
    x = 962,675.96

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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.