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Finding the Fourth Proportional to 934.80, 1,392.51 and 913.20

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Solution

The fourth proportional to 934.80, 1,392.51 and 913.20 is: 1,360.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.80 : 1,392.51 = 913.20 : x
  2. Step 2: Convert to fraction form
    934.80/1,392.51 = 913.20/x
  3. Step 3: Cross multiply
    934.80x = 1,392.51 × 913.20
  4. Step 4: Simplify right side
    934.80x = 1,271,640.13
  5. Step 5: Solve for x
    x = 1,271,640.13/934.80
  6. Step 6: Final answer
    x = 1,360.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.