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Finding the Fourth Proportional to 934.64, 1,291.55 and 715.13

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Solution

The fourth proportional to 934.64, 1,291.55 and 715.13 is: 988.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.64 : 1,291.55 = 715.13 : x
  2. Step 2: Convert to fraction form
    934.64/1,291.55 = 715.13/x
  3. Step 3: Cross multiply
    934.64x = 1,291.55 × 715.13
  4. Step 4: Simplify right side
    934.64x = 923,620.96
  5. Step 5: Solve for x
    x = 923,620.96/934.64
  6. Step 6: Final answer
    x = 988.21

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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.