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Finding the Fourth Proportional to 943.30, 1,407.11 and 928.18

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Solution

The fourth proportional to 943.30, 1,407.11 and 928.18 is: 1,384.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.30 : 1,407.11 = 928.18 : x
  2. Step 2: Convert to fraction form
    943.30/1,407.11 = 928.18/x
  3. Step 3: Cross multiply
    943.30x = 1,407.11 × 928.18
  4. Step 4: Simplify right side
    943.30x = 1,306,051.36
  5. Step 5: Solve for x
    x = 1,306,051.36/943.30
  6. Step 6: Final answer
    x = 1,384.56

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1.5x scale

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.