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Finding the Fourth Proportional to 876.88, 1,210.09 and 478.53

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Solution

The fourth proportional to 876.88, 1,210.09 and 478.53 is: 660.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.88 : 1,210.09 = 478.53 : x
  2. Step 2: Convert to fraction form
    876.88/1,210.09 = 478.53/x
  3. Step 3: Cross multiply
    876.88x = 1,210.09 × 478.53
  4. Step 4: Simplify right side
    876.88x = 579,067.47
  5. Step 5: Solve for x
    x = 579,067.47/876.88
  6. Step 6: Final answer
    x = 660.38

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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.