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Finding the Fourth Proportional to 1,029.51, 1,421.15 and 715.23

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Solution

The fourth proportional to 1,029.51, 1,421.15 and 715.23 is: 987.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.51 : 1,421.15 = 715.23 : x
  2. Step 2: Convert to fraction form
    1,029.51/1,421.15 = 715.23/x
  3. Step 3: Cross multiply
    1,029.51x = 1,421.15 × 715.23
  4. Step 4: Simplify right side
    1,029.51x = 1,016,445.54
  5. Step 5: Solve for x
    x = 1,016,445.54/1,029.51
  6. Step 6: Final answer
    x = 987.31

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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.