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Finding the Fourth Proportional to 1,123.16, 1,685.63 and 778.91

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Solution

The fourth proportional to 1,123.16, 1,685.63 and 778.91 is: 1,168.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.16 : 1,685.63 = 778.91 : x
  2. Step 2: Convert to fraction form
    1,123.16/1,685.63 = 778.91/x
  3. Step 3: Cross multiply
    1,123.16x = 1,685.63 × 778.91
  4. Step 4: Simplify right side
    1,123.16x = 1,312,958.44
  5. Step 5: Solve for x
    x = 1,312,958.44/1,123.16
  6. Step 6: Final answer
    x = 1,168.98

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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.