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Finding the Fourth Proportional to 1,089.20, 1,502.89 and 647.21

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Solution

The fourth proportional to 1,089.20, 1,502.89 and 647.21 is: 893.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.20 : 1,502.89 = 647.21 : x
  2. Step 2: Convert to fraction form
    1,089.20/1,502.89 = 647.21/x
  3. Step 3: Cross multiply
    1,089.20x = 1,502.89 × 647.21
  4. Step 4: Simplify right side
    1,089.20x = 972,687.58
  5. Step 5: Solve for x
    x = 972,687.58/1,089.20
  6. Step 6: Final answer
    x = 893.03

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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.