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Finding the Fourth Proportional to 876.38, 1,209.40 and 689.51

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Solution

The fourth proportional to 876.38, 1,209.40 and 689.51 is: 951.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.38 : 1,209.40 = 689.51 : x
  2. Step 2: Convert to fraction form
    876.38/1,209.40 = 689.51/x
  3. Step 3: Cross multiply
    876.38x = 1,209.40 × 689.51
  4. Step 4: Simplify right side
    876.38x = 833,894.69
  5. Step 5: Solve for x
    x = 833,894.69/876.38
  6. Step 6: Final answer
    x = 951.53

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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.