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Finding the Fourth Proportional to 872.57, 1,307.90 and 409.98

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Solution

The fourth proportional to 872.57, 1,307.90 and 409.98 is: 614.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.57 : 1,307.90 = 409.98 : x
  2. Step 2: Convert to fraction form
    872.57/1,307.90 = 409.98/x
  3. Step 3: Cross multiply
    872.57x = 1,307.90 × 409.98
  4. Step 4: Simplify right side
    872.57x = 536,210.79
  5. Step 5: Solve for x
    x = 536,210.79/872.57
  6. Step 6: Final answer
    x = 614.52

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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.