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Finding the Fourth Proportional to 1,135.15, 1,699.99 and 646.72

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Solution

The fourth proportional to 1,135.15, 1,699.99 and 646.72 is: 968.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.15 : 1,699.99 = 646.72 : x
  2. Step 2: Convert to fraction form
    1,135.15/1,699.99 = 646.72/x
  3. Step 3: Cross multiply
    1,135.15x = 1,699.99 × 646.72
  4. Step 4: Simplify right side
    1,135.15x = 1,099,417.53
  5. Step 5: Solve for x
    x = 1,099,417.53/1,135.15
  6. Step 6: Final answer
    x = 968.52

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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.