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Finding the Fourth Proportional to 876.19, 1,209.16 and 477.88

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Solution

The fourth proportional to 876.19, 1,209.16 and 477.88 is: 659.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.19 : 1,209.16 = 477.88 : x
  2. Step 2: Convert to fraction form
    876.19/1,209.16 = 477.88/x
  3. Step 3: Cross multiply
    876.19x = 1,209.16 × 477.88
  4. Step 4: Simplify right side
    876.19x = 577,833.38
  5. Step 5: Solve for x
    x = 577,833.38/876.19
  6. Step 6: Final answer
    x = 659.48

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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.