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Finding the Fourth Proportional to 1,020.10, 1,405.64 and 784.04

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Solution

The fourth proportional to 1,020.10, 1,405.64 and 784.04 is: 1,080.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.10 : 1,405.64 = 784.04 : x
  2. Step 2: Convert to fraction form
    1,020.10/1,405.64 = 784.04/x
  3. Step 3: Cross multiply
    1,020.10x = 1,405.64 × 784.04
  4. Step 4: Simplify right side
    1,020.10x = 1,102,067.04
  5. Step 5: Solve for x
    x = 1,102,067.04/1,020.10
  6. Step 6: Final answer
    x = 1,080.35

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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.