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Finding the Fourth Proportional to 990.24, 1,485.06 and 715.56

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Solution

The fourth proportional to 990.24, 1,485.06 and 715.56 is: 1,073.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.24 : 1,485.06 = 715.56 : x
  2. Step 2: Convert to fraction form
    990.24/1,485.06 = 715.56/x
  3. Step 3: Cross multiply
    990.24x = 1,485.06 × 715.56
  4. Step 4: Simplify right side
    990.24x = 1,062,649.53
  5. Step 5: Solve for x
    x = 1,062,649.53/990.24
  6. Step 6: Final answer
    x = 1,073.12

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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.