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Finding the Fourth Proportional to 1,319,868.98, 1,821,419.20 and 716,256.98

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Solution

The fourth proportional to 1,319,868.98, 1,821,419.20 and 716,256.98 is: 988,434.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319,868.98 : 1,821,419.20 = 716,256.98 : x
  2. Step 2: Convert to fraction form
    1,319,868.98/1,821,419.20 = 716,256.98/x
  3. Step 3: Cross multiply
    1,319,868.98x = 1,821,419.20 × 716,256.98
  4. Step 4: Simplify right side
    1,319,868.98x = 1,304,604,222,355.57
  5. Step 5: Solve for x
    x = 1,304,604,222,355.57/1,319,868.98
  6. Step 6: Final answer
    x = 988,434.64

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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.