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Finding the Fourth Proportional to 1,029.71, 1,421.15 and 587.55

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Solution

The fourth proportional to 1,029.71, 1,421.15 and 587.55 is: 810.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.71 : 1,421.15 = 587.55 : x
  2. Step 2: Convert to fraction form
    1,029.71/1,421.15 = 587.55/x
  3. Step 3: Cross multiply
    1,029.71x = 1,421.15 × 587.55
  4. Step 4: Simplify right side
    1,029.71x = 834,999.07
  5. Step 5: Solve for x
    x = 834,999.07/1,029.71
  6. Step 6: Final answer
    x = 810.91

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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.