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Finding the Fourth Proportional to 1,118.60, 1,678.54 and 928.52

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Solution

The fourth proportional to 1,118.60, 1,678.54 and 928.52 is: 1,393.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.60 : 1,678.54 = 928.52 : x
  2. Step 2: Convert to fraction form
    1,118.60/1,678.54 = 928.52/x
  3. Step 3: Cross multiply
    1,118.60x = 1,678.54 × 928.52
  4. Step 4: Simplify right side
    1,118.60x = 1,558,557.96
  5. Step 5: Solve for x
    x = 1,558,557.96/1,118.60
  6. Step 6: Final answer
    x = 1,393.31

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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.