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Finding the Fourth Proportional to 1,109.68, 1,663.98 and 785.68

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Solution

The fourth proportional to 1,109.68, 1,663.98 and 785.68 is: 1,178.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.68 : 1,663.98 = 785.68 : x
  2. Step 2: Convert to fraction form
    1,109.68/1,663.98 = 785.68/x
  3. Step 3: Cross multiply
    1,109.68x = 1,663.98 × 785.68
  4. Step 4: Simplify right side
    1,109.68x = 1,307,355.81
  5. Step 5: Solve for x
    x = 1,307,355.81/1,109.68
  6. Step 6: Final answer
    x = 1,178.14

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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.