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Finding the Fourth Proportional to 987.15, 1,468.02 and 956.40

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Solution

The fourth proportional to 987.15, 1,468.02 and 956.40 is: 1,422.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.15 : 1,468.02 = 956.40 : x
  2. Step 2: Convert to fraction form
    987.15/1,468.02 = 956.40/x
  3. Step 3: Cross multiply
    987.15x = 1,468.02 × 956.40
  4. Step 4: Simplify right side
    987.15x = 1,404,014.33
  5. Step 5: Solve for x
    x = 1,404,014.33/987.15
  6. Step 6: Final answer
    x = 1,422.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.