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Finding the Fourth Proportional to 1,029.71, 1,421.10 and 587.68

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Solution

The fourth proportional to 1,029.71, 1,421.10 and 587.68 is: 811.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.71 : 1,421.10 = 587.68 : x
  2. Step 2: Convert to fraction form
    1,029.71/1,421.10 = 587.68/x
  3. Step 3: Cross multiply
    1,029.71x = 1,421.10 × 587.68
  4. Step 4: Simplify right side
    1,029.71x = 835,153.36
  5. Step 5: Solve for x
    x = 835,153.36/1,029.71
  6. Step 6: Final answer
    x = 811.06

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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.