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Finding the Fourth Proportional to 1,030.04, 1,421.06 and 680.12

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Solution

The fourth proportional to 1,030.04, 1,421.06 and 680.12 is: 938.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,030.04 : 1,421.06 = 680.12 : x
  2. Step 2: Convert to fraction form
    1,030.04/1,421.06 = 680.12/x
  3. Step 3: Cross multiply
    1,030.04x = 1,421.06 × 680.12
  4. Step 4: Simplify right side
    1,030.04x = 966,491.33
  5. Step 5: Solve for x
    x = 966,491.33/1,030.04
  6. Step 6: Final answer
    x = 938.30

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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.