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Finding the Fourth Proportional to 1,176.42, 1,623.51 and 783.18

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Solution

The fourth proportional to 1,176.42, 1,623.51 and 783.18 is: 1,080.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,176.42 : 1,623.51 = 783.18 : x
  2. Step 2: Convert to fraction form
    1,176.42/1,623.51 = 783.18/x
  3. Step 3: Cross multiply
    1,176.42x = 1,623.51 × 783.18
  4. Step 4: Simplify right side
    1,176.42x = 1,271,500.56
  5. Step 5: Solve for x
    x = 1,271,500.56/1,176.42
  6. Step 6: Final answer
    x = 1,080.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.