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Finding the Fourth Proportional to 1,308.68, 1,808.25 and 972.08

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Solution

The fourth proportional to 1,308.68, 1,808.25 and 972.08 is: 1,343.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.68 : 1,808.25 = 972.08 : x
  2. Step 2: Convert to fraction form
    1,308.68/1,808.25 = 972.08/x
  3. Step 3: Cross multiply
    1,308.68x = 1,808.25 × 972.08
  4. Step 4: Simplify right side
    1,308.68x = 1,757,763.66
  5. Step 5: Solve for x
    x = 1,757,763.66/1,308.68
  6. Step 6: Final answer
    x = 1,343.16

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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.