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Finding the Fourth Proportional to 987.42, 1,480.72 and 370.81

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Solution

The fourth proportional to 987.42, 1,480.72 and 370.81 is: 556.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.42 : 1,480.72 = 370.81 : x
  2. Step 2: Convert to fraction form
    987.42/1,480.72 = 370.81/x
  3. Step 3: Cross multiply
    987.42x = 1,480.72 × 370.81
  4. Step 4: Simplify right side
    987.42x = 549,058.38
  5. Step 5: Solve for x
    x = 549,058.38/987.42
  6. Step 6: Final answer
    x = 556.05

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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.