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Finding the Fourth Proportional to 784.48, 1,175.28 and 611.68

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Solution

The fourth proportional to 784.48, 1,175.28 and 611.68 is: 916.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.48 : 1,175.28 = 611.68 : x
  2. Step 2: Convert to fraction form
    784.48/1,175.28 = 611.68/x
  3. Step 3: Cross multiply
    784.48x = 1,175.28 × 611.68
  4. Step 4: Simplify right side
    784.48x = 718,895.27
  5. Step 5: Solve for x
    x = 718,895.27/784.48
  6. Step 6: Final answer
    x = 916.40

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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.