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Finding the Fourth Proportional to 128,849.71, 177,804.57 and 77,832.30

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Solution

The fourth proportional to 128,849.71, 177,804.57 and 77,832.30 is: 107,403.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,849.71 : 177,804.57 = 77,832.30 : x
  2. Step 2: Convert to fraction form
    128,849.71/177,804.57 = 77,832.30/x
  3. Step 3: Cross multiply
    128,849.71x = 177,804.57 × 77,832.30
  4. Step 4: Simplify right side
    128,849.71x = 13,838,938,428.98
  5. Step 5: Solve for x
    x = 13,838,938,428.98/128,849.71
  6. Step 6: Final answer
    x = 107,403.72

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1.5x scale

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.