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Finding the Fourth Proportional to 1,137.29, 1,569.45 and 788.18

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Solution

The fourth proportional to 1,137.29, 1,569.45 and 788.18 is: 1,087.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.29 : 1,569.45 = 788.18 : x
  2. Step 2: Convert to fraction form
    1,137.29/1,569.45 = 788.18/x
  3. Step 3: Cross multiply
    1,137.29x = 1,569.45 × 788.18
  4. Step 4: Simplify right side
    1,137.29x = 1,237,001.25
  5. Step 5: Solve for x
    x = 1,237,001.25/1,137.29
  6. Step 6: Final answer
    x = 1,087.68

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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.