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Finding the Fourth Proportional to 987.31, 1,480.75 and 370.99

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Solution

The fourth proportional to 987.31, 1,480.75 and 370.99 is: 556.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.31 : 1,480.75 = 370.99 : x
  2. Step 2: Convert to fraction form
    987.31/1,480.75 = 370.99/x
  3. Step 3: Cross multiply
    987.31x = 1,480.75 × 370.99
  4. Step 4: Simplify right side
    987.31x = 549,343.44
  5. Step 5: Solve for x
    x = 549,343.44/987.31
  6. Step 6: Final answer
    x = 556.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.