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Finding the Fourth Proportional to 1,191.12, 1,642.08 and 957.84

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Solution

The fourth proportional to 1,191.12, 1,642.08 and 957.84 is: 1,320.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.12 : 1,642.08 = 957.84 : x
  2. Step 2: Convert to fraction form
    1,191.12/1,642.08 = 957.84/x
  3. Step 3: Cross multiply
    1,191.12x = 1,642.08 × 957.84
  4. Step 4: Simplify right side
    1,191.12x = 1,572,849.91
  5. Step 5: Solve for x
    x = 1,572,849.91/1,191.12
  6. Step 6: Final answer
    x = 1,320.48

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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.