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Finding the Fourth Proportional to 660,962.76, 989,906.28 and 642,780.01

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Solution

The fourth proportional to 660,962.76, 989,906.28 and 642,780.01 is: 962,674.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,962.76 : 989,906.28 = 642,780.01 : x
  2. Step 2: Convert to fraction form
    660,962.76/989,906.28 = 642,780.01/x
  3. Step 3: Cross multiply
    660,962.76x = 989,906.28 × 642,780.01
  4. Step 4: Simplify right side
    660,962.76x = 636,291,968,557.46
  5. Step 5: Solve for x
    x = 636,291,968,557.46/660,962.76
  6. Step 6: Final answer
    x = 962,674.46

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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.