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Finding the Fourth Proportional to 1,149.48, 1,585.76 and 776.70

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Solution

The fourth proportional to 1,149.48, 1,585.76 and 776.70 is: 1,071.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,149.48 : 1,585.76 = 776.70 : x
  2. Step 2: Convert to fraction form
    1,149.48/1,585.76 = 776.70/x
  3. Step 3: Cross multiply
    1,149.48x = 1,585.76 × 776.70
  4. Step 4: Simplify right side
    1,149.48x = 1,231,655.91
  5. Step 5: Solve for x
    x = 1,231,655.91/1,149.48
  6. Step 6: Final answer
    x = 1,071.49

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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.