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Finding the Fourth Proportional to 1,007.12, 1,390.28 and 675.76

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Solution

The fourth proportional to 1,007.12, 1,390.28 and 675.76 is: 932.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.12 : 1,390.28 = 675.76 : x
  2. Step 2: Convert to fraction form
    1,007.12/1,390.28 = 675.76/x
  3. Step 3: Cross multiply
    1,007.12x = 1,390.28 × 675.76
  4. Step 4: Simplify right side
    1,007.12x = 939,495.61
  5. Step 5: Solve for x
    x = 939,495.61/1,007.12
  6. Step 6: Final answer
    x = 932.85

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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.