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Finding the Fourth Proportional to 987.05, 1,480.58 and 554.51

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Solution

The fourth proportional to 987.05, 1,480.58 and 554.51 is: 831.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.05 : 1,480.58 = 554.51 : x
  2. Step 2: Convert to fraction form
    987.05/1,480.58 = 554.51/x
  3. Step 3: Cross multiply
    987.05x = 1,480.58 × 554.51
  4. Step 4: Simplify right side
    987.05x = 820,999.42
  5. Step 5: Solve for x
    x = 820,999.42/987.05
  6. Step 6: Final answer
    x = 831.77

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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.