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Finding the Fourth Proportional to 1,009.48, 1,514.22 and 643.90

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Solution

The fourth proportional to 1,009.48, 1,514.22 and 643.90 is: 965.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.48 : 1,514.22 = 643.90 : x
  2. Step 2: Convert to fraction form
    1,009.48/1,514.22 = 643.90/x
  3. Step 3: Cross multiply
    1,009.48x = 1,514.22 × 643.90
  4. Step 4: Simplify right side
    1,009.48x = 975,006.26
  5. Step 5: Solve for x
    x = 975,006.26/1,009.48
  6. Step 6: Final answer
    x = 965.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.