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Finding the Fourth Proportional to 1,020.13, 1,407.53 and 577.87

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Solution

The fourth proportional to 1,020.13, 1,407.53 and 577.87 is: 797.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.13 : 1,407.53 = 577.87 : x
  2. Step 2: Convert to fraction form
    1,020.13/1,407.53 = 577.87/x
  3. Step 3: Cross multiply
    1,020.13x = 1,407.53 × 577.87
  4. Step 4: Simplify right side
    1,020.13x = 813,367.29
  5. Step 5: Solve for x
    x = 813,367.29/1,020.13
  6. Step 6: Final answer
    x = 797.32

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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.