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Finding the Fourth Proportional to 873.24, 1,205.38 and 578.60

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Solution

The fourth proportional to 873.24, 1,205.38 and 578.60 is: 798.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.24 : 1,205.38 = 578.60 : x
  2. Step 2: Convert to fraction form
    873.24/1,205.38 = 578.60/x
  3. Step 3: Cross multiply
    873.24x = 1,205.38 × 578.60
  4. Step 4: Simplify right side
    873.24x = 697,432.87
  5. Step 5: Solve for x
    x = 697,432.87/873.24
  6. Step 6: Final answer
    x = 798.67

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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.