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Finding the Fourth Proportional to 1,128.02, 1,690.23 and 1,015.10

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Solution

The fourth proportional to 1,128.02, 1,690.23 and 1,015.10 is: 1,521.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.02 : 1,690.23 = 1,015.10 : x
  2. Step 2: Convert to fraction form
    1,128.02/1,690.23 = 1,015.10/x
  3. Step 3: Cross multiply
    1,128.02x = 1,690.23 × 1,015.10
  4. Step 4: Simplify right side
    1,128.02x = 1,715,752.47
  5. Step 5: Solve for x
    x = 1,715,752.47/1,128.02
  6. Step 6: Final answer
    x = 1,521.03

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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.