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Finding the Fourth Proportional to 1,515.61, 2,090.81 and 1,018.98

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Solution

The fourth proportional to 1,515.61, 2,090.81 and 1,018.98 is: 1,405.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.61 : 2,090.81 = 1,018.98 : x
  2. Step 2: Convert to fraction form
    1,515.61/2,090.81 = 1,018.98/x
  3. Step 3: Cross multiply
    1,515.61x = 2,090.81 × 1,018.98
  4. Step 4: Simplify right side
    1,515.61x = 2,130,496.12
  5. Step 5: Solve for x
    x = 2,130,496.12/1,515.61
  6. Step 6: Final answer
    x = 1,405.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.