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Finding the Fourth Proportional to 880.18, 1,214.62 and 487.20

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Solution

The fourth proportional to 880.18, 1,214.62 and 487.20 is: 672.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.18 : 1,214.62 = 487.20 : x
  2. Step 2: Convert to fraction form
    880.18/1,214.62 = 487.20/x
  3. Step 3: Cross multiply
    880.18x = 1,214.62 × 487.20
  4. Step 4: Simplify right side
    880.18x = 591,762.86
  5. Step 5: Solve for x
    x = 591,762.86/880.18
  6. Step 6: Final answer
    x = 672.32

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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.