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Finding the Fourth Proportional to 880.77, 1,215.45 and 487.79

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Solution

The fourth proportional to 880.77, 1,215.45 and 487.79 is: 673.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.77 : 1,215.45 = 487.79 : x
  2. Step 2: Convert to fraction form
    880.77/1,215.45 = 487.79/x
  3. Step 3: Cross multiply
    880.77x = 1,215.45 × 487.79
  4. Step 4: Simplify right side
    880.77x = 592,878.28
  5. Step 5: Solve for x
    x = 592,878.28/880.77
  6. Step 6: Final answer
    x = 673.14

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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.