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Finding the Fourth Proportional to 1,316.22, 1,972.20 and 621.24

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Solution

The fourth proportional to 1,316.22, 1,972.20 and 621.24 is: 930.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.22 : 1,972.20 = 621.24 : x
  2. Step 2: Convert to fraction form
    1,316.22/1,972.20 = 621.24/x
  3. Step 3: Cross multiply
    1,316.22x = 1,972.20 × 621.24
  4. Step 4: Simplify right side
    1,316.22x = 1,225,209.53
  5. Step 5: Solve for x
    x = 1,225,209.53/1,316.22
  6. Step 6: Final answer
    x = 930.85

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1.5x scale

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.