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Finding the Fourth Proportional to 876.84, 1,312.16 and 645.18

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Solution

The fourth proportional to 876.84, 1,312.16 and 645.18 is: 965.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.84 : 1,312.16 = 645.18 : x
  2. Step 2: Convert to fraction form
    876.84/1,312.16 = 645.18/x
  3. Step 3: Cross multiply
    876.84x = 1,312.16 × 645.18
  4. Step 4: Simplify right side
    876.84x = 846,576.16
  5. Step 5: Solve for x
    x = 846,576.16/876.84
  6. Step 6: Final answer
    x = 965.49

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Double scale
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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.