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Finding the Fourth Proportional to 1,335.65, 2,001.05 and 985.13

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Solution

The fourth proportional to 1,335.65, 2,001.05 and 985.13 is: 1,475.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,335.65 : 2,001.05 = 985.13 : x
  2. Step 2: Convert to fraction form
    1,335.65/2,001.05 = 985.13/x
  3. Step 3: Cross multiply
    1,335.65x = 2,001.05 × 985.13
  4. Step 4: Simplify right side
    1,335.65x = 1,971,294.39
  5. Step 5: Solve for x
    x = 1,971,294.39/1,335.65
  6. Step 6: Final answer
    x = 1,475.91

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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.