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Finding the Fourth Proportional to 716.48, 1,075.08 and 661.40

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Solution

The fourth proportional to 716.48, 1,075.08 and 661.40 is: 992.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.48 : 1,075.08 = 661.40 : x
  2. Step 2: Convert to fraction form
    716.48/1,075.08 = 661.40/x
  3. Step 3: Cross multiply
    716.48x = 1,075.08 × 661.40
  4. Step 4: Simplify right side
    716.48x = 711,057.91
  5. Step 5: Solve for x
    x = 711,057.91/716.48
  6. Step 6: Final answer
    x = 992.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.