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Finding the Fourth Proportional to 1,019.30, 1,520.34 and 988.53

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Solution

The fourth proportional to 1,019.30, 1,520.34 and 988.53 is: 1,474.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.30 : 1,520.34 = 988.53 : x
  2. Step 2: Convert to fraction form
    1,019.30/1,520.34 = 988.53/x
  3. Step 3: Cross multiply
    1,019.30x = 1,520.34 × 988.53
  4. Step 4: Simplify right side
    1,019.30x = 1,502,901.70
  5. Step 5: Solve for x
    x = 1,502,901.70/1,019.30
  6. Step 6: Final answer
    x = 1,474.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.