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Finding the Fourth Proportional to 501.77, 695.60 and 491.71

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Solution

The fourth proportional to 501.77, 695.60 and 491.71 is: 681.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.77 : 695.60 = 491.71 : x
  2. Step 2: Convert to fraction form
    501.77/695.60 = 491.71/x
  3. Step 3: Cross multiply
    501.77x = 695.60 × 491.71
  4. Step 4: Simplify right side
    501.77x = 342,033.48
  5. Step 5: Solve for x
    x = 342,033.48/501.77
  6. Step 6: Final answer
    x = 681.65

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.