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Finding the Fourth Proportional to 1,020.43, 1,530.65 and 875.25

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Solution

The fourth proportional to 1,020.43, 1,530.65 and 875.25 is: 1,312.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.43 : 1,530.65 = 875.25 : x
  2. Step 2: Convert to fraction form
    1,020.43/1,530.65 = 875.25/x
  3. Step 3: Cross multiply
    1,020.43x = 1,530.65 × 875.25
  4. Step 4: Simplify right side
    1,020.43x = 1,339,701.41
  5. Step 5: Solve for x
    x = 1,339,701.41/1,020.43
  6. Step 6: Final answer
    x = 1,312.88

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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.