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Finding the Fourth Proportional to 1,418.42, 1,957.84 and 977.42

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Solution

The fourth proportional to 1,418.42, 1,957.84 and 977.42 is: 1,349.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.42 : 1,957.84 = 977.42 : x
  2. Step 2: Convert to fraction form
    1,418.42/1,957.84 = 977.42/x
  3. Step 3: Cross multiply
    1,418.42x = 1,957.84 × 977.42
  4. Step 4: Simplify right side
    1,418.42x = 1,913,631.97
  5. Step 5: Solve for x
    x = 1,913,631.97/1,418.42
  6. Step 6: Final answer
    x = 1,349.13

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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.