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Finding the Fourth Proportional to 880.66, 1,215.30 and 487.68

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Solution

The fourth proportional to 880.66, 1,215.30 and 487.68 is: 672.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.66 : 1,215.30 = 487.68 : x
  2. Step 2: Convert to fraction form
    880.66/1,215.30 = 487.68/x
  3. Step 3: Cross multiply
    880.66x = 1,215.30 × 487.68
  4. Step 4: Simplify right side
    880.66x = 592,677.50
  5. Step 5: Solve for x
    x = 592,677.50/880.66
  6. Step 6: Final answer
    x = 672.99

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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.