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Finding the Fourth Proportional to 1,026.72, 1,415.68 and 972

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Solution

The fourth proportional to 1,026.72, 1,415.68 and 972 is: 1,340.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,026.72 : 1,415.68 = 972 : x
  2. Step 2: Convert to fraction form
    1,026.72/1,415.68 = 972/x
  3. Step 3: Cross multiply
    1,026.72x = 1,415.68 × 972
  4. Step 4: Simplify right side
    1,026.72x = 1,376,040.96
  5. Step 5: Solve for x
    x = 1,376,040.96/1,026.72
  6. Step 6: Final answer
    x = 1,340.23

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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.