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Finding the Fourth Proportional to 880.38, 1,214.91 and 487.40

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Solution

The fourth proportional to 880.38, 1,214.91 and 487.40 is: 672.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.38 : 1,214.91 = 487.40 : x
  2. Step 2: Convert to fraction form
    880.38/1,214.91 = 487.40/x
  3. Step 3: Cross multiply
    880.38x = 1,214.91 × 487.40
  4. Step 4: Simplify right side
    880.38x = 592,141.06
  5. Step 5: Solve for x
    x = 592,141.06/880.38
  6. Step 6: Final answer
    x = 672.60

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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.