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Finding the Fourth Proportional to 987.02, 1,480.53 and 554.48

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Solution

The fourth proportional to 987.02, 1,480.53 and 554.48 is: 831.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.02 : 1,480.53 = 554.48 : x
  2. Step 2: Convert to fraction form
    987.02/1,480.53 = 554.48/x
  3. Step 3: Cross multiply
    987.02x = 1,480.53 × 554.48
  4. Step 4: Simplify right side
    987.02x = 820,924.27
  5. Step 5: Solve for x
    x = 820,924.27/987.02
  6. Step 6: Final answer
    x = 831.72

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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.