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Finding the Fourth Proportional to 1,018.95, 1,528.37 and 316.15

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Solution

The fourth proportional to 1,018.95, 1,528.37 and 316.15 is: 474.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.95 : 1,528.37 = 316.15 : x
  2. Step 2: Convert to fraction form
    1,018.95/1,528.37 = 316.15/x
  3. Step 3: Cross multiply
    1,018.95x = 1,528.37 × 316.15
  4. Step 4: Simplify right side
    1,018.95x = 483,189.96
  5. Step 5: Solve for x
    x = 483,189.96/1,018.95
  6. Step 6: Final answer
    x = 474.21

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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.