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Finding the Fourth Proportional to 1,180,428, 1,628,990.64 and 643,884

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Solution

The fourth proportional to 1,180,428, 1,628,990.64 and 643,884 is: 888,559.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180,428 : 1,628,990.64 = 643,884 : x
  2. Step 2: Convert to fraction form
    1,180,428/1,628,990.64 = 643,884/x
  3. Step 3: Cross multiply
    1,180,428x = 1,628,990.64 × 643,884
  4. Step 4: Simplify right side
    1,180,428x = 1,048,881,009,245.76
  5. Step 5: Solve for x
    x = 1,048,881,009,245.76/1,180,428
  6. Step 6: Final answer
    x = 888,559.92

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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.