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Finding the Fourth Proportional to 660,961.76, 989,904.78 and 642,779.01

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Solution

The fourth proportional to 660,961.76, 989,904.78 and 642,779.01 is: 962,672.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,961.76 : 989,904.78 = 642,779.01 : x
  2. Step 2: Convert to fraction form
    660,961.76/989,904.78 = 642,779.01/x
  3. Step 3: Cross multiply
    660,961.76x = 989,904.78 × 642,779.01
  4. Step 4: Simplify right side
    660,961.76x = 636,290,014,482.67
  5. Step 5: Solve for x
    x = 636,290,014,482.67/660,961.76
  6. Step 6: Final answer
    x = 962,672.97

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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.