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Finding the Fourth Proportional to 880.51, 1,215.11 and 487.55

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Solution

The fourth proportional to 880.51, 1,215.11 and 487.55 is: 672.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.51 : 1,215.11 = 487.55 : x
  2. Step 2: Convert to fraction form
    880.51/1,215.11 = 487.55/x
  3. Step 3: Cross multiply
    880.51x = 1,215.11 × 487.55
  4. Step 4: Simplify right side
    880.51x = 592,426.88
  5. Step 5: Solve for x
    x = 592,426.88/880.51
  6. Step 6: Final answer
    x = 672.82

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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.