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Finding the Fourth Proportional to 876.46, 1,209.07 and 561.39

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Solution

The fourth proportional to 876.46, 1,209.07 and 561.39 is: 774.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.46 : 1,209.07 = 561.39 : x
  2. Step 2: Convert to fraction form
    876.46/1,209.07 = 561.39/x
  3. Step 3: Cross multiply
    876.46x = 1,209.07 × 561.39
  4. Step 4: Simplify right side
    876.46x = 678,759.81
  5. Step 5: Solve for x
    x = 678,759.81/876.46
  6. Step 6: Final answer
    x = 774.43

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Double scale
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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.