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Finding the Fourth Proportional to 1,190.48, 1,642.40 and 718.24

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Solution

The fourth proportional to 1,190.48, 1,642.40 and 718.24 is: 990.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.48 : 1,642.40 = 718.24 : x
  2. Step 2: Convert to fraction form
    1,190.48/1,642.40 = 718.24/x
  3. Step 3: Cross multiply
    1,190.48x = 1,642.40 × 718.24
  4. Step 4: Simplify right side
    1,190.48x = 1,179,637.38
  5. Step 5: Solve for x
    x = 1,179,637.38/1,190.48
  6. Step 6: Final answer
    x = 990.89

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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.