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Finding the Fourth Proportional to 1,030.91, 1,421.96 and 637.25

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Solution

The fourth proportional to 1,030.91, 1,421.96 and 637.25 is: 878.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,030.91 : 1,421.96 = 637.25 : x
  2. Step 2: Convert to fraction form
    1,030.91/1,421.96 = 637.25/x
  3. Step 3: Cross multiply
    1,030.91x = 1,421.96 × 637.25
  4. Step 4: Simplify right side
    1,030.91x = 906,133.71
  5. Step 5: Solve for x
    x = 906,133.71/1,030.91
  6. Step 6: Final answer
    x = 878.97

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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.