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Finding the Fourth Proportional to 1,396.80, 1,925.40 and 930.24

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Solution

The fourth proportional to 1,396.80, 1,925.40 and 930.24 is: 1,282.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.80 : 1,925.40 = 930.24 : x
  2. Step 2: Convert to fraction form
    1,396.80/1,925.40 = 930.24/x
  3. Step 3: Cross multiply
    1,396.80x = 1,925.40 × 930.24
  4. Step 4: Simplify right side
    1,396.80x = 1,791,084.10
  5. Step 5: Solve for x
    x = 1,791,084.10/1,396.80
  6. Step 6: Final answer
    x = 1,282.28

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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.