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Finding the Fourth Proportional to 1,019.10, 1,528.65 and 652.80

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Solution

The fourth proportional to 1,019.10, 1,528.65 and 652.80 is: 979.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.10 : 1,528.65 = 652.80 : x
  2. Step 2: Convert to fraction form
    1,019.10/1,528.65 = 652.80/x
  3. Step 3: Cross multiply
    1,019.10x = 1,528.65 × 652.80
  4. Step 4: Simplify right side
    1,019.10x = 997,902.72
  5. Step 5: Solve for x
    x = 997,902.72/1,019.10
  6. Step 6: Final answer
    x = 979.20

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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.