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Finding the Fourth Proportional to 876.03, 1,208.90 and 689.19

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Solution

The fourth proportional to 876.03, 1,208.90 and 689.19 is: 951.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.03 : 1,208.90 = 689.19 : x
  2. Step 2: Convert to fraction form
    876.03/1,208.90 = 689.19/x
  3. Step 3: Cross multiply
    876.03x = 1,208.90 × 689.19
  4. Step 4: Simplify right side
    876.03x = 833,158.35
  5. Step 5: Solve for x
    x = 833,158.35/876.03
  6. Step 6: Final answer
    x = 951.06

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Half scale
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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.