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Finding the Fourth Proportional to 1,030.22, 1,421.79 and 631.88

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Solution

The fourth proportional to 1,030.22, 1,421.79 and 631.88 is: 872.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,030.22 : 1,421.79 = 631.88 : x
  2. Step 2: Convert to fraction form
    1,030.22/1,421.79 = 631.88/x
  3. Step 3: Cross multiply
    1,030.22x = 1,421.79 × 631.88
  4. Step 4: Simplify right side
    1,030.22x = 898,400.67
  5. Step 5: Solve for x
    x = 898,400.67/1,030.22
  6. Step 6: Final answer
    x = 872.05

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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.