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Finding the Fourth Proportional to 1,445.61, 2,167.11 and 520.95

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Solution

The fourth proportional to 1,445.61, 2,167.11 and 520.95 is: 780.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.61 : 2,167.11 = 520.95 : x
  2. Step 2: Convert to fraction form
    1,445.61/2,167.11 = 520.95/x
  3. Step 3: Cross multiply
    1,445.61x = 2,167.11 × 520.95
  4. Step 4: Simplify right side
    1,445.61x = 1,128,955.95
  5. Step 5: Solve for x
    x = 1,128,955.95/1,445.61
  6. Step 6: Final answer
    x = 780.95

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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.