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Finding the Fourth Proportional to 987.53, 1,480.74 and 621.53

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Solution

The fourth proportional to 987.53, 1,480.74 and 621.53 is: 931.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.53 : 1,480.74 = 621.53 : x
  2. Step 2: Convert to fraction form
    987.53/1,480.74 = 621.53/x
  3. Step 3: Cross multiply
    987.53x = 1,480.74 × 621.53
  4. Step 4: Simplify right side
    987.53x = 920,328.03
  5. Step 5: Solve for x
    x = 920,328.03/987.53
  6. Step 6: Final answer
    x = 931.95

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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.