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Finding the Fourth Proportional to 991,478.08, 1,368,239.88 and 538,768

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Solution

The fourth proportional to 991,478.08, 1,368,239.88 and 538,768 is: 743,499.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    991,478.08 : 1,368,239.88 = 538,768 : x
  2. Step 2: Convert to fraction form
    991,478.08/1,368,239.88 = 538,768/x
  3. Step 3: Cross multiply
    991,478.08x = 1,368,239.88 × 538,768
  4. Step 4: Simplify right side
    991,478.08x = 737,163,863,667.84
  5. Step 5: Solve for x
    x = 737,163,863,667.84/991,478.08
  6. Step 6: Final answer
    x = 743,499.91

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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.