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Finding the Fourth Proportional to 1,019.52, 1,407.36 and 665.88

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Solution

The fourth proportional to 1,019.52, 1,407.36 and 665.88 is: 919.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.52 : 1,407.36 = 665.88 : x
  2. Step 2: Convert to fraction form
    1,019.52/1,407.36 = 665.88/x
  3. Step 3: Cross multiply
    1,019.52x = 1,407.36 × 665.88
  4. Step 4: Simplify right side
    1,019.52x = 937,132.88
  5. Step 5: Solve for x
    x = 937,132.88/1,019.52
  6. Step 6: Final answer
    x = 919.19

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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.