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Finding the Fourth Proportional to 1,019.68, 1,407.16 and 553.93

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Solution

The fourth proportional to 1,019.68, 1,407.16 and 553.93 is: 764.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.68 : 1,407.16 = 553.93 : x
  2. Step 2: Convert to fraction form
    1,019.68/1,407.16 = 553.93/x
  3. Step 3: Cross multiply
    1,019.68x = 1,407.16 × 553.93
  4. Step 4: Simplify right side
    1,019.68x = 779,468.14
  5. Step 5: Solve for x
    x = 779,468.14/1,019.68
  6. Step 6: Final answer
    x = 764.42

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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.