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Finding the Fourth Proportional to 1,121, 1,681.62 and 504.98

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Solution

The fourth proportional to 1,121, 1,681.62 and 504.98 is: 757.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121 : 1,681.62 = 504.98 : x
  2. Step 2: Convert to fraction form
    1,121/1,681.62 = 504.98/x
  3. Step 3: Cross multiply
    1,121x = 1,681.62 × 504.98
  4. Step 4: Simplify right side
    1,121x = 849,184.47
  5. Step 5: Solve for x
    x = 849,184.47/1,121
  6. Step 6: Final answer
    x = 757.52

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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.