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Finding the Fourth Proportional to 1,415.68, 2,124.56 and 928.56

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Solution

The fourth proportional to 1,415.68, 2,124.56 and 928.56 is: 1,393.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.68 : 2,124.56 = 928.56 : x
  2. Step 2: Convert to fraction form
    1,415.68/2,124.56 = 928.56/x
  3. Step 3: Cross multiply
    1,415.68x = 2,124.56 × 928.56
  4. Step 4: Simplify right side
    1,415.68x = 1,972,781.43
  5. Step 5: Solve for x
    x = 1,972,781.43/1,415.68
  6. Step 6: Final answer
    x = 1,393.52

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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.