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Finding the Fourth Proportional to 1,407.40, 1,940.40 and 909.16

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Solution

The fourth proportional to 1,407.40, 1,940.40 and 909.16 is: 1,253.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.40 : 1,940.40 = 909.16 : x
  2. Step 2: Convert to fraction form
    1,407.40/1,940.40 = 909.16/x
  3. Step 3: Cross multiply
    1,407.40x = 1,940.40 × 909.16
  4. Step 4: Simplify right side
    1,407.40x = 1,764,134.06
  5. Step 5: Solve for x
    x = 1,764,134.06/1,407.40
  6. Step 6: Final answer
    x = 1,253.47

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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.