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Finding the Fourth Proportional to 1,786.40, 2,465.40 and 1,030.20

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Solution

The fourth proportional to 1,786.40, 2,465.40 and 1,030.20 is: 1,421.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.40 : 2,465.40 = 1,030.20 : x
  2. Step 2: Convert to fraction form
    1,786.40/2,465.40 = 1,030.20/x
  3. Step 3: Cross multiply
    1,786.40x = 2,465.40 × 1,030.20
  4. Step 4: Simplify right side
    1,786.40x = 2,539,841.01
  5. Step 5: Solve for x
    x = 2,539,841.01/1,786.40
  6. Step 6: Final answer
    x = 1,421.77

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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.