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Finding the Fourth Proportional to 501.80, 691.47 and 477.90

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Solution

The fourth proportional to 501.80, 691.47 and 477.90 is: 658.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.80 : 691.47 = 477.90 : x
  2. Step 2: Convert to fraction form
    501.80/691.47 = 477.90/x
  3. Step 3: Cross multiply
    501.80x = 691.47 × 477.90
  4. Step 4: Simplify right side
    501.80x = 330,453.51
  5. Step 5: Solve for x
    x = 330,453.51/501.80
  6. Step 6: Final answer
    x = 658.54

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1.5x scale

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.