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Finding the Fourth Proportional to 1,243.58, 1,715.90 and 845.55

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Solution

The fourth proportional to 1,243.58, 1,715.90 and 845.55 is: 1,166.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.58 : 1,715.90 = 845.55 : x
  2. Step 2: Convert to fraction form
    1,243.58/1,715.90 = 845.55/x
  3. Step 3: Cross multiply
    1,243.58x = 1,715.90 × 845.55
  4. Step 4: Simplify right side
    1,243.58x = 1,450,875.02
  5. Step 5: Solve for x
    x = 1,450,875.02/1,243.58
  6. Step 6: Final answer
    x = 1,166.70

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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.