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Finding the Fourth Proportional to 880.70, 1,215.32 and 487.70

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Solution

The fourth proportional to 880.70, 1,215.32 and 487.70 is: 673.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.70 : 1,215.32 = 487.70 : x
  2. Step 2: Convert to fraction form
    880.70/1,215.32 = 487.70/x
  3. Step 3: Cross multiply
    880.70x = 1,215.32 × 487.70
  4. Step 4: Simplify right side
    880.70x = 592,711.56
  5. Step 5: Solve for x
    x = 592,711.56/880.70
  6. Step 6: Final answer
    x = 673.00

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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.