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Finding the Fourth Proportional to 1,040.17, 1,435.31 and 647.32

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Solution

The fourth proportional to 1,040.17, 1,435.31 and 647.32 is: 893.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.17 : 1,435.31 = 647.32 : x
  2. Step 2: Convert to fraction form
    1,040.17/1,435.31 = 647.32/x
  3. Step 3: Cross multiply
    1,040.17x = 1,435.31 × 647.32
  4. Step 4: Simplify right side
    1,040.17x = 929,101.63
  5. Step 5: Solve for x
    x = 929,101.63/1,040.17
  6. Step 6: Final answer
    x = 893.22

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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.