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Finding the Fourth Proportional to 1,337.92, 2,005.51 and 678.58

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Solution

The fourth proportional to 1,337.92, 2,005.51 and 678.58 is: 1,017.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,337.92 : 2,005.51 = 678.58 : x
  2. Step 2: Convert to fraction form
    1,337.92/2,005.51 = 678.58/x
  3. Step 3: Cross multiply
    1,337.92x = 2,005.51 × 678.58
  4. Step 4: Simplify right side
    1,337.92x = 1,360,898.98
  5. Step 5: Solve for x
    x = 1,360,898.98/1,337.92
  6. Step 6: Final answer
    x = 1,017.18

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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.