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Finding the Fourth Proportional to 880.76, 1,215.46 and 487.81

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Solution

The fourth proportional to 880.76, 1,215.46 and 487.81 is: 673.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.76 : 1,215.46 = 487.81 : x
  2. Step 2: Convert to fraction form
    880.76/1,215.46 = 487.81/x
  3. Step 3: Cross multiply
    880.76x = 1,215.46 × 487.81
  4. Step 4: Simplify right side
    880.76x = 592,907.47
  5. Step 5: Solve for x
    x = 592,907.47/880.76
  6. Step 6: Final answer
    x = 673.18

Related Problems

Find fourth proportional to 440.38, 607.73 and 243.90
Half scale
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Double scale
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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.