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Finding the Fourth Proportional to 1,089.36, 1,630.08 and 780.48

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Solution

The fourth proportional to 1,089.36, 1,630.08 and 780.48 is: 1,167.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.36 : 1,630.08 = 780.48 : x
  2. Step 2: Convert to fraction form
    1,089.36/1,630.08 = 780.48/x
  3. Step 3: Cross multiply
    1,089.36x = 1,630.08 × 780.48
  4. Step 4: Simplify right side
    1,089.36x = 1,272,244.84
  5. Step 5: Solve for x
    x = 1,272,244.84/1,089.36
  6. Step 6: Final answer
    x = 1,167.88

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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.