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Finding the Fourth Proportional to 1,114.78, 1,671.62 and 652.68

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Solution

The fourth proportional to 1,114.78, 1,671.62 and 652.68 is: 978.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.78 : 1,671.62 = 652.68 : x
  2. Step 2: Convert to fraction form
    1,114.78/1,671.62 = 652.68/x
  3. Step 3: Cross multiply
    1,114.78x = 1,671.62 × 652.68
  4. Step 4: Simplify right side
    1,114.78x = 1,091,032.94
  5. Step 5: Solve for x
    x = 1,091,032.94/1,114.78
  6. Step 6: Final answer
    x = 978.70

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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.