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Finding the Fourth Proportional to 977.63, 1,349.38 and 663.42

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Solution

The fourth proportional to 977.63, 1,349.38 and 663.42 is: 915.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.63 : 1,349.38 = 663.42 : x
  2. Step 2: Convert to fraction form
    977.63/1,349.38 = 663.42/x
  3. Step 3: Cross multiply
    977.63x = 1,349.38 × 663.42
  4. Step 4: Simplify right side
    977.63x = 895,205.68
  5. Step 5: Solve for x
    x = 895,205.68/977.63
  6. Step 6: Final answer
    x = 915.69

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1.5x scale

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.